TSSA Gas Technician II Practice Exam

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• Which arrangement yields 240 V for a residential air conditioner from the service panel?
• What should be done to the orifice size when converting an appliance from natural gas to propane?
• Deliming a water heater tank can involve using muriatic acid in addition to which substance?
• A mercury bulb mechanical thermostat with one heating and one cooling stage is an example of which switch type?
• What is the restricting element on a direct-operated regulator?
• Another requirement for a vaporizer in a propane system is to:
• What is the required pipe size for section A?
• Another vapour withdrawal method uses which feature on the withdrawal valve?
• Outdoor air supply opening size for appliances without a draft hood and input of 125,000 Btu/h.
• When connecting a domestic appliance to rigid piping with a flexible metal connector, where should the shutoff valve be placed?
• A continuous pilot is defined as which type of pilot?
• The rod and tube sensing device is typically found on which type of equipment?
• What is the unit used to express appliance input calculations in the examples?
• Negative pressure is normally associated with which side of the building?
• Which is a typical relief valve setting for a propane cylinder?
• The furnaces described in the example have what AFUE rating?
• What is the effect of an anticipator set too high on the heating system?
• Another requirement for a vaporizer in a propane system is to:
• Which value is a listed appliance input calculation in the examples?
• Thermocouple dropout voltage is typically in which range?
• As temperature increases, what happens to the resistance of a thermistor?
• What is the primary purpose of the anode in a storage tank?
• Another gas meter shipping position requirement
• Vent connector material must have corrosion resistance at least equivalent to which specification?
• Building codes now require that all new homes are constructed with which items?
• Which standard is a relief valve requirement for cylinders?
• Which statement best describes the location of upper air supply openings?
• What is the area of openings required for a furnace room?
• What is the minimum distance in feet between a propane tank and the property line for tanks over 5000 USWG when the value is 15 ft?
• What is the function of balancing valves in a heating loop of a combo system?
• What does an open contact indicate when measuring resistance?
• What is the purpose of a mixing valve on a combo system?
• Which components are included in a combination gas control valve?
• Where is an inline ammeter connected when testing current draw?
• Which statement best describes where a hydrostatic relief device is placed in relation to the regulator?
• The installation of electric baseboard heating describes which method?
• As described in typical safety guidelines, which condition triggers a low water cutoff?
• Which agency for propane specifications is Transport Canada?
• The common setting for a high-limit aquastat is which temperature?
• What is the minimum electrical service panel rating in most new residential construction?
• A diaphragm gas valve venting into a combustion chamber may be vented if which condition is met?
• In a propane regulator, which pressure is a closing force?
• Which of the following could cause undesirable flame characteristics?
• Among the furnace sizes listed in the example, which is the largest?
• What is the adjusted capacity for a 5- inch vent when three elbows are used?
• What is the recognized minimum aperture size of a combustion air inlet screen?
• Which type of regulator has an internal lock-off mechanism?
• How should you set an adjustable anticipator in a thermostat?
• Which sealing method is most effective for reducing air leakage around openings?
• What is the input rate of each boiler?
• Vent termination distance rule from a service regulator is described as which of the following?
• Which problem could cause hot boiler water but no heating when the circulating pump is moving?
• What is the maximum appliance input for which thermocouples are approved?
• Besides pickling vinegar, which chemical can be used to delime a water heater tank?
• A major area to seal against air leakage to improve heat loss is which of the following?
• Which outcome is most likely if combustion air is restricted and makeup air is not provided?
• Where are vapour barriers typically placed relative to insulation in the material?
• Which statement correctly describes vent-line requirements for a regulator?
• What wire type is most appropriate and cost effective for a residential basement?
• Which action helps prevent premature burner burn-out in a barbecue?
• Which statement best describes the rule for manually operated dampers?
• Which is another common relief valve setting for a propane cylinder?
• How many basic types of low-water cutoff switches are there?
• What is a bimetal?
• Low Pressure LMR value?
• Relative humidity level should be which range in a home?
• In ductwork, what is the role of wire mesh?
• Which term describes a regulator that cannot be adjusted and maintains a fixed outlet pressure?
• Filtration best describes the process of which of the following?
• What is the primary effect of a bathroom exhaust fan?
• Gas meter shipping position requirement
• For an appliance without a draft hood and input of 235,000 BTUH, which is the largest listed size?
• Which of the following is not listed as a barbeque ignition option?
• What is the definition of an indoor swimming pool heater?
• In a typical home, which statement about voltages is true?
• Incinerator venting may be vented into which types of chimneys?
• Which statement reflects a design goal for vapour barriers mentioned in the material?
• Which term describes a regulator that acts by moving the diaphragm directly in response to upstream pressure?
• Which regulator setting is NOT listed as a propane regulator setting in the data?
• For an appliance designed for a special venting system, what venting is permitted?
• If a system regulator lacks internal relief, what device is required?
• Which of the following describes energised and de-energised positions for schematic contacts?
• Which statement best differentiates a control relay from a contactor?
• What wire type is most appropriate for moisture conditions?
• Which device is an example of a combustion safety control?
• Which factor affects the vaporization rate of a propane container?
• Which factor most directly affects the risk of backdrafting in a house with gas appliances?
• What is the effect of increasing current on the magnetic field around a conductor?
• How should dryer exhaust ducts be joined?
• During closed-circuit testing, the expected millivolt reading is which of the following?
• Which device generates a small voltage when heated due to dissimilar metals?
• Which of the following is a pressure unit used in the data?
• For an appliance with a draft hood and 185,000 BTUH input, which is the largest listed combustion/dilution air inlet size?
• Fresh air ducts in modern houses primarily provide which function?
• Cylinder re-examination and testing frequency includes which interval?
• The hydrostatic relief valve is used on which type of line to release excessive pressure caused by trapped LNG?
• Normal pilot flame characteristics describe which of the following?
• What is the hot junction in a thermocouple?
• Which is a permanent propane installation requirement about regulator stages?
• The sizing of outdoor air supply openings for loads over 400,000 Btu/h is governed by which clause?
• Double layering the moisture barrier is a technique used to what?
• A residential mid or high efficiency furnace or power vented water heater operates on which type of power supply?
• Which component is commonly targeted first to reduce air leakage?
• Which outcome is described as a possible effect of winter ventilation on humidity in the air?
• A manually operated flue damper in a residential dwelling requires which safety feature?
• Direct-vent appliance definition
• Which statement best describes a Powerpile?
• Which statement best describes the relationship between the listed regulator types and internal lock-off mechanisms?
• Which of the following is a propane vapour pressure value of 172.0 psig?
• Limit and safety controllers respond to changes in what, and do what as a result?
• Is bypassing a pressure regulator allowed?
• Tables in the B149.1 Code used to size outdoor air supply for non-air tight structures for appliances having draft control or not having draft control.
• Which type of regulator on a propane barbecue is partially adjustable?
• Which of the following is also a purpose of the two-stage regulator system?
• In a hot water radiator system, heat moving from the radiator surface into the surrounding air is primarily by which mechanism?
• Combustion air provided from inside the building is replaced by which of the following?
• For direct vent appliances, where should the ventilation air inlet be located?
• Which factor can contribute to negative pressure in a building?
• Which type of convection occurs due to buoyancy forces when a fluid's natural movement transports heat?
• Which of the following is the minimum water heater size recommended for a CSA-approved combination system?
• What indicates the flow direction on a gas pressure regulator?
• Gas meter test dial purpose
• Spillage is indicated when which of the following occurs?
• What is the minimum aperture size of a combustion air inlet screen?
• The driving force behind stack effect is the difference in which property between indoor and outdoor air?
• Labeling of relay contacts should be:
• Which of the following lists contains the two maximum numbers of 100-pound propane cylinders allowed on a construction site?
• How many B149 codes are presented in the material?
• Outdoor air supply opening required for appliances without a draft hood and input of 125,000 Btu/h.
• A depressurization test is used to estimate building air leakage by measuring...
• Which of the following is a listed open-circuit reading for thermocouples?
• What is the millivolt reading for drop-out condition?
• During a thermocouple open circuit test, what condition is essential for a valid reading?
• Which statement correctly describes the temperature rise concept?
• What is the vent height for a venting system?
• How should the pressure regulator vent be vented according to the requirement?
• In the thermocouple open-circuit reading data, which range is listed as 10-20 MV?
• Which practice directly addresses air leakage and heat loss?
• For vapour withdrawal, which connection option is used in one method?
• Air supply inlet from outdoor shall be located not less than how many inches above grade level?
• Which of the following is the millivolt reading associated with closed-circuit testing?
• Schedule 80 piping requirement
• What type of vent is required when a recessed wall furnace is installed in a partition?
• Which statement best reflects the scope of the B149.1 Code tables for outdoor air sizing in non-air tight structures?
• The equivalent length of a four inch forged tee is approximately:
• One of the most important areas to seal against air leakage and improve heat loss is which of the following?
• What is a primary function of a gas regulator?
• Which instrument would you use to measure current in a circuit?
• Liquid propane piping
• Which device monitors the flow rate and can shut down the boiler if flow is too low?
• Which appliances are not required to be connected to a vent or chimney?
• What is the recommended relative humidity range for homes?
• An appliance without a draft control device and an input of 150,000 Btu/h is installed in an enclosure or structure that is air tight - What is the outdoor air supply opening required?
• Which feature describes the ability to shut off flow positively in propane regulators?
• Where should wire connections be made according to the rule described?
• What term describes the time permitted to establish ignition?
• In the combustion and ventilation air openings size examples, what is the free area of the upper opening?
• Which statement about condensation in flue gases is accurate?
• If the main disconnect switch is open, what is the behavior of the components?
• Condensation of water vapour in combustion products or flue gases is true or false?
• What is the Cold Junction in a thermocouple?
• Which component operates on the principle of being a semi-conductor and is used as a simple rectifier?
• What is the other maximum number of 100-pound propane cylinders allowed on a construction site?
• What is the minimum recommended frequency for the cycle of a combination system pump?
• What is the input rate of each unit heater?
• What color insulation is commonly associated with pink fiberglass insulation?
• Which option best represents all factors that can cause elevated CO2 levels in a home?
• Millivolt readings - Open circuit (another alternative)
• Which statement is listed as a design goal for vapour barriers in the material?
• What condition allows current to be conducted through the flame when using two flame rods?
• Which device acts as an operating safety control to prevent boiler water temperature from exceeding safe levels?
• What is the name of the first weld pass when welding a fitting to a pipe?
• What is the function of an overpressure relief device located downstream of the regulator?
• Where should a GFCI circuit breaker be reset?
• What is the unit of measurement for electrical resistance?
• Which component is used to regulate gas flow from a cylinder to an appliance?
• What is the purpose of a hydrostatic overpressure or line relief device located upstream of the regulator?
• Which switches are contained in a typical combination high-limit/fan control switch?
• In which boilers would you typically find a flow switch?
• In open-circuit testing, which millivolt value is specified?
• Ventilation air inlet requirement for direct vent appliances located between 6\" - 18\" from the floor.
• In a spark-ignition dryer, which device senses flame heat to de-energize the ignition spark?
• Millivolt readings - Open circuit (alternative)
• An appliance that uses indoor combustion air is not considered what type of appliance?
• What is the required method for bonding conductors?
• Moisture buildup in a building is directly related to which factor?
• Which pair of temperatures are used to determine the temperature rise across a water heater?
• Unions and swing joints made by a combination of fittings shall not be used where piping is to be...
• During purging, which pair of contaminants is removed from a propane cylinder?
• The effective flue area must be not less than which of the following?
• What is described as a manual shut-off valve?
• What advantage does a circuit breaker have over a glass plug fuse?
• Compared with copper, how does #14 AWG aluminum wire perform in current-carrying capacity?
• What is the maximum negative building pressure for a draft hood appliance?
• Under what condition may a gas-fired appliance and a solid-fuel appliance be vented into a common chimney?
• Which of the following is another propane vapour pressure value?
• Purging a cylinder before filling with propane primarily removes which substances?
• Which of the following describes a replacement for combustion air provided from inside the building?
• What is the stated purpose of T & P valve operation?
• Which of the following is a listed relief valve setting for a propane tank?
• Which component is described as a backup safety switch in a heating system?
• What is the size of the combustion/dilution air inlet for an appliance without a draft hood and an input of 235,000 BTUH?
• When may a single wall vent connector be installed in an unheated space?
• What are electrical service measurement units?
• What is the main reason for using a gas pressure regulator?
• Apertures in a fixed louver or grille shall have no dimension smaller than how many inches?
• Outdoor air supply opening size for appliances without a draft hood and input of 125,000 Btu/h.
• Which of the following is the largest listed outdoor air opening for draft-control appliances?
• Switches can be actuated in response to changes in:
• Which description best matches a radiant heater installed in a masonry fireplace?
• Which instrument measures amperage?
• Rod and tube water heater control valve sensing material options include which among the following?
• Installing a water softener helps prevent which issue in water heating systems?
• Which statement best describes a manual shut-off valve?
• Millivolt readings - Closed circuit (alternative)
• What are control relays?
• Which diameter vent corresponds to a capacity of 122 MBtu/h before reduction?
• In the High Pressure LMR calculation, what is the base LMR value before adding the elbow term?
• Which term describes a regulator that can be adjusted to set the output pressure over a range?
• In the data, which unit is used to express the pressure drop across a gas meter, i.e., inches of water column?
• What is the millivolt reading for closed-circuit measurement?
• Which joining method is prohibited for dryer exhaust ducts?
• The flame sensor consisting of a tube constructed of quartz is commonly known as what?
• Which of the following are listed as causes of spillage?
• Occupant usage in a building can cause which of the following changes?
• What is indicated when an appliance with a draft hood has spillage?
• Which labeling convention is recommended for relay contacts?
• Which of the following is a listed lower opening free area in the combustion and ventilation air openings size options?
• What is a purpose of the two-stage regulator system?
• Which of the following represents the recommended maximum percentage of a cylinder's volume that should be filled with liquid propane?
• To ensure proper gas flow across a wide range of conditions, the regulator should be designed to provide the required flow across what range?
• Which option lists the largest among the listed minimum rectangle fresh air intake sizes in square inches?
• What describes a decorative appliance?
• Stack effect causes air to move primarily through openings at which location?
• The input rate of each boiler is
• Which of the following is a framing method listed in the material?
• Which value is the lowest maximum vapour pressure listed?
• Which standard is a relief valve requirement for cylinders? (B 149.2)
• What is the minimum distance in feet between a propane tank and the property line for tanks over 5000 USWG when the value is 25 ft?
• A cost-effective method of decreasing fuel costs is to
• What is the maximum spacing of supports for NPS 1¼ gas pipe in a home?
• As temperature increases, what happens to current flow through a thermistor?
• Which gauge thickness is allowed for vent connectors for incinerators?
• Duct tape is described as which type of method for holding duct sections?
• Which factor is an indicator of gas meter usage related to safety?
• Outdoor air supply opening required for appliances with draft control.
• Which option is listed as a gas meter test dial purpose?
• Which statement correctly pairs ignition type with maximum hose length for a gas-fired barbecue?
• If two dip tubes are installed in a water heater, what is the likely outcome for hot water supply?
• Which statement about gas meter bypass is correct?
• What is the purpose of a mantle on a gas lamp?
• Which statement is true regarding purging propane cylinders?
• What is the required pipe size for section F?
• The building skin includes which elements?
• Switch rating is described as:
• What does HRV stand for in ventilation technology?
• Which value is NOT listed as an appliance input calculation value?
• Which of the following is NOT a listed requirement for propane cylinders on construction sites?
• The table used to size air supply openings based on total input of appliances with draft control is which table?
• Which measurement is described by a thermometer with a wet wick around its bulb?
• What is the minimum ventilation air specified for a master bedroom?
• In vapour withdrawal methods, which option is used for a connection?
• What material should be used to join dryer exhaust ducts?
• What is the primary purpose of a building's exterior skin?
• Manual motor-starting switches contain which of the following for sensing higher-than-normal currents drawn by the motor?
• Which reading is not listed among the expected open-circuit thermocouple values?
• Under which condition must a line pressure regulator be of the positive shut-off type?
• Which wire size is rated for use on a 15 amp circuit?
• The dip tube length should be long enough to terminate at which level?
• According to Clause 8.2.6, what is the size of openings required per 1000 Btuh of total input?
• Propane cylinder on construction site must be equipped with which of the following?
• Purging ensures that the cylinder is free of what before filling?
• Which option is a traditional framing method listed in the material?
• Which measure is least effective on its own for preventing backdrafting hazards?
• How is the High Pressure LMR calculated?
• A vaporizer in a propane system is required to:
• Which fastening method is required to secure a domestic gas dryer exhaust duct?
• What is the capacity of a 6-inch vent after applying the 10% reduction?
• Which instrument measures resistance?
• Which of the following values is not a listed maximum vapour pressure for recreation vehicles?
• How are circuit breakers installed?
• Heat transfer from the hot water in the system to the pipe wall occurs mainly by which mechanism?
• The term 'building skin' refers to which of the following?
• For a 50,000 BTUH water heater, what is the minimum clearance from the flue outlet to grade level?
• What does SPDT stand for?
• Which of the following is a cylinder re-examination interval?
• Which statement best describes how limit controls are depicted on schematic diagrams?
• Where is an overpressure relief device located relative to the regulator?
• Diaphragm gas valve venting into combustion chamber may be vented under which condition?
• Another requirement for refillable cylinders is which Transport Canada regulation?
• When air supply is provided by mechanical means, into which circuit shall an air flow sensing device be wired?
• Which category has more listed combustion/dilution air inlet sizes in the provided data?
• What prevents the water in a hydronic heating system from boiling into steam?
• In winter, ventilation air tends to do which of the following to relative humidity?
• Smallest permitted dimension for an air supply duct according to B149.1 Code, Clause 8.3.2.
• What is the primary purpose of sealing exterior openings against air leakage?
• Which measure is listed as a cost-effective option to reduce fuel costs?
• What is the length of the lateral vent connector?
• Which statement reflects vaporization factors?
• Which unit is used to express appliance input calculations in the examples?
• What are fuses or circuit breakers?
• In a propane regulator, which pressure is the closing force?
• The 'stack effect' experienced in buildings can be limited by which option?
• Which condition triggers a low water cut off requirement on a hot water boiler?
• Natural draft appliances rely on which mechanism to draw combustion air and exhaust gases?
• What is the expected closed circuit voltage reading for a thermocouple?
• In a spark-ignition dryer, which component de-energizes the ignition spark?
• What is a sign of high humidity in a room with multiple occupants?
• How is the single vent line area determined for gas overpressure relief devices?
• Which pair of tables is used for non-air tight structures according to the second cited set?
• The difference between High Pressure Total Input and Low Pressure Total Input is?
• Not less than that of the largest draft-control device outlet or the largest flue outlet, plus 20% of the sum of the outlet areas of the additional appliances is the definition of what?
• What does a closed-circuit test measure?
• Which of the following best describes a resistance reading across a closed contact?
• Which condition is listed as a probable cause of a cold house with hot boiler water and the circulating pump running, indicating a control issue?
• Which withdrawal method uses hoses rated at 100 psig?
• An appliance with a draft hood and an input of 125,000 Btu/h is installed in a building that has an equivalent leakage area of 0.05 m2 at a differential of 10 Pa - What is the outdoor air supply opening required?
• Which of the following represents the minimum height above grade level for an outdoor air inlet?
• Which option correctly completes: Vapour barriers are designed to ______ moisture in the building envelope according to the material?
• Another requirement for a vaporizer in a propane system is to:
• As part of vaporizer system requirements, which adjustment is listed?
• Which rating applies to a single-family dwelling boiler?
• Outdoor air supply to a single water heater is not required for an input up to how many BTUH?
• Among the furnace sizes listed in the example, which is the smallest?
• An operating aquastat that controls the temperature of the water inside the boiler is an SPDT switch normally open that does what?
• Which material is used in an infrared scanner cell?
• Which component is used to switch the dryer motor from start to run?
• Smallest permitted dimension for an air supply duct according to B149.1 Code, Clause 8.3.2.
• Which is another purpose of the two-stage regulator system?
• A flame sensor described as a quartz tube is commonly called what?
• What does a depressurization test determine?
• Can gas piping be used as an electrical ground in a gas installation?
• What is the pressure relief valve setting on a propane tank?
• Which option is described as the method most commonly used by modern builders?
• If the total input is 200,000 Btuh, what is the required air opening size per 8.2.6?
• According to the options provided, which construction method is considered modern by the material?
• For a range burner with a control valve located at the rear, what is required for installation?
• Which statement about the provided data is true?
• What is the boiler rating for a single-family dwelling?
• What is the purpose of venting a separate relief line to the outside?
• Moisture exhaust duct sections on a dryer are held together using which method?
• What is the required size of the air supply opening for a 50,000 Btu/h water heater?
• What is a recognized method for testing gas piping before use?
• What is the voltage for hot surface igniters that light the main burner?
• What is the resistance reading across an open contact?
• Where is the anticipator connected in relation to the thermostat's R, W, and Y contacts?
• What is the minimum distance in feet between a propane tank and the property line for tanks over 5000 USWG when the value is 10 ft?
• During the first stage of a two-stage gas valve system with a two-stage thermostat, at what firing rate does the valve open?
• Which of the following represents a possible minimum rectangle fresh air intake size?
• Which statement about venting for a combination oil/gas appliance is true?
• In a direct-operated regulator, which component is the measuring element?
• For an appliance with a draft hood and 185,000 BTUH input, which listed size is 29 square inches?
• What minimum distance from the grade level should be maintained from a 50,000 BTUH water heater flue outlet?
• Which statement best describes humidity readings when using the wet/dry bulb method?
• What does the stacking effect in a storage water heater refer to?
• Indication of high pressure usage for a low capacity regulator corresponds to which term?
• Which control device operates on the principle of being a semi-conductor?
• What is the primary purpose of the regulator vent line?
• What does an open-circuit test measure in a thermocouple arrangement?
• What is the expected drop out voltage for a thermocouple?
• A single wall vent connector may pass through a ceiling under which condition?
• Which withdrawal method uses a male thread on the withdrawal valve?
• What is the propane vapour pressure at 100.0 °F?
• Heat loss in a residential building is greatest through
• Which conductor size is rated for use on a 30 amp circuit?
• Which action increases downstream pressure by turning the regulator spring counterclockwise?
• Under what gas pressure condition are gas-pressure switches required by code on burner systems?
• Which of the following is true regarding the use of a single wall vent connector through an unheated space?
• Attic insulation practices include which of the following to support energy efficiency and air sealing?
• What would an indication of voltage drop across a closed switch suggest?
• For an appliance with a draft hood and 185,000 BTUH, what is the second smallest listed combustion/dilution air inlet size?
• Combustion air provided from inside the building is replaced by which of the following?
• Negative pressure in a building can cause problems for draft hood appliances by which condition?
• Fuse size is determined by which of the following
• Which action is listed as a potential thermocouple problem?
• Which option represents a required characteristic of a mechanical combustion air intake?
• Which statement correctly describes the pipe sizes for sections A through E?
• Type D fuse stands for and where would it be used?
• Which statement describes a compliance requirement for a mechanical combustion air intake?
• What is the recommended installation side for vapour barriers according to the material?
• Another gas meter test dial purpose
• Maximum ampacity values for overcurrent protection devices are specified in which codes?
• What voltage range do thermocouples typically generate?
• For appliances designed for a special venting system, which vent type is permitted?
• Where should a separate relief line be vented?
• For an appliance without a draft hood and input of 235,000 BTUH, which of the following is a listed combustion/dilution air inlet size?
• Which of the following is identified as a modern framing method in the material?
• Installing two dip tubes in a water heater would likely result in what?
• Which voltage reading indicates a healthy closed circuit in a thermocouple?
• What is a setting on a single stage propane regulator?
• Type L vent usage is described as which of the following?
• Which of the following is stated about vapour barriers in relation to moisture movement?
• Which value is closest to 150 psig among the propane vapour pressure values?
• Which option best describes the function of a draft hood on an atmospheric furnace?
• BX is commonly used in residential, commercial, and industrial applications where wiring may be exposed to which of the following?
• Electric baseboard heating is described as which method?
• In a propane regulator, which pressure is the closing force?
• Which listed outdoor air opening for appliances with draft control is 13 sq in?
• The pressure reference for draft hood context is expressed as what sign and unit?
• Armoured cable (AC) is often referred to as...
• Which of the following is a plausible relief valve setting for a propane tank?
• Select the rule that uses 1 gpm per 1,000 BTUH input.
• If the vent line extends beyond 50 ft (15 m), what action is required for the vent arrangement?
• Dry bulb temperature is defined as?
• What describes a domestic hot water appliance?
• Which statement describes the proper use of a manually operated damper?
• What are the switch positions and where is the switch typically located?
• Which item is a potential fault that could lead to heat not being delivered despite hot boiler water and running pump?
• What is the pre-use inspection requirement for a barbecue each season?
• Where is a voltmeter connected when testing voltage drop?
• Which of the following statements about draft hood appliances under negative pressure is true?
• 20 L/s is equal to how many cubic feet per minute (cfm)?
• An appliance input calculation from a natural gas meter test dial (2 cubic feet in 15 seconds) yields which Btuh?
• Ventilation air inlet requirement for category one appliances not required.
• What is an additional requirement for attic insulation?
• Which code covers the installation of propane appliances on vehicles?
• What is the effect of the minimum burner flame setting on oven temperature?
• Which statement about duct tape is true?
• A residential mid or high efficiency furnace or power vented water heater works on which power supply?
• Vapour withdrawal on a propane tank uses which type of thread?
• Which device is an example of a limit or safety controller?
• What is another setting on a single stage propane regulator?
• Which of the following is a relief valve setting for a propane cylinder?
• What is the equivalent length of a four inch forged tee?
• What is another setting on a single stage propane regulator?
• For an appliance with a draft hood and 185,000 BTUH input, which of the following is listed as a combustion/dilution air inlet size?
• Which option is NOT a standard maximum fill level for liquid propane in a cylinder?
• Which regulation governs the transport of dangerous goods in Canada?
• Which fitting is required at the point where a vent connector enters a lined masonry chimney?
• Which conversion is correct for 10 L/s to CFM?
• A low water cut off is required on a hot water boiler when the input rating is greater than which Btuh?
• Supply pressure from natural gas meter?
• In a propane regulator, which pressure is a closing force?
• Which of the following describes the function of a magnetic field in an armature system?
• In a hot water radiator system, the primary mechanism for transferring heat from circulating water to the surrounding air is which?
• For a vent with a diameter of 5 inches, what is its capacity when it is greater than 120 MBtu/h?
• Which outdoor air opening size is required for a non-draft-control appliance with an input of 150,000 Btu/h installed in an airtight enclosure?
• Wet bulb temperature is defined as which of the following?
• Which voltage is used by large home appliances such as ranges and dryers?
• What is the Low Pressure Total Input in Btuh?
• In a 120/24V transformer, what is the typical primary voltage reading?
• What is the process of converting alternating current to direct current called?
• What does the term 'spillage' mean in the context of venting a water heater?
• From the following, which list contains unacceptable fittings?
• Which option describes a safety-related feature in propane systems?
• Which statement about vent line requirements is true?
• What is the open circuit output of a thermocouple?
• What is the effect of increasing temperature on copper wire resistance?
• Another gas meter test dial purpose
• Purging is required when a cylinder has just been purchased.
• What is the result of the first appliance input calculation?
• Which pair of temperatures are used to calculate the temperature rise across a water heater?
• What is the term for air moving from the interior of a building to the outdoors?
• Which of the following is the correct pump sizing rule for water heater combo systems?
• What is the required size of the air supply opening for a 1,500,000 Btu/h appliance?
• Which test is used to measure air leakage by depressurizing a building?
• What causes stack effect?
• What is the primary purpose of gas meters in residential service?
• Which device is used to control gas pressure entering downstream piping?
• What is the result of the third appliance input calculation?
• Which statement about circuit breaker terminals is true?
• What happens to the magnetic field when current increases?
• What is the final capacity for a 5 inch vent after applying the 10% reduction?
• What is the effect of a narrow differential setting on temperature control and burner cycles?
• Lower opening location should be located between which distance above the floor?
• Where should the T&P valve be located in the storage tank?
• What minimum ratio must be maintained between grounding area and flame rod?
• The hot water storage tank rating is required to be what?
• Which factor most influences the effectiveness of a combustion air inlet screen?
• Which term describes converting alternating current to direct current?
• A propane cylinder on a construction site must be equipped with which of the following?
• Which value is listed as an appliance input calculation in the examples?
• Purging a propane cylinder before filling is primarily intended to remove which substances?
• What is a plausible minimum dimension for a combustion air inlet screen?
• When to purge a gas line
• Which agency for propane specifications is TSSA?
• In high-temperature sensing capillary tubes, which substance is used?
• Propane cylinder on construction site must be equipped with which device?
• What is the stated minimum pump cycle frequency for a combo system according to the notes?
• Which factors are considered when selecting the correct gas regulator?
• Which term best describes energy transfer via electromagnetic waves emitted by a hot object?
• Incinerator venting options are described as which of the following?
• Which vent diameter has a base capacity of 186 MBtu/h?
• What is the calculation for the 6-inch vent capacity after applying the 10% reduction, given a base capacity of 186 MBtu/h?
• Which option corresponds to a regulator setting of 14 inches of water column?
• What is the primary function of a gas regulator?
• Natural draft appliances rely on which mechanism to move combustion air and exhaust gases?
• Air infiltration commonly results in increased heat loss. Which statement best describes this effect?
• A 50,000 Btu/h water heater requires an air supply opening of how many square inches?
• What is the function of the minimum burner flame on oven control?
• Which conductor size is rated for use on a 20 amp circuit?
• Which device among the listed has the highest input rate?
• Which action increases downstream pressure?
• Which of the following best describes a potential risk of improper combustion air provision?
• Which statement about the two-stage regulator system is true?
• In the shower temperature example, what is the measured drop in water temperature?
• Which standard is a relief valve requirement for cylinders? (B 149.1)
• What is the function of a high-limit aquastat in a heating system?
• Direct vent appliances use a sealed combustion system to draw air from outside for combustion. Which statement is true?
• Excess flow valve is used for which purpose?
• Which action increases downstream pressure?
• If Type B vent is unavailable for the required installation, what vent may be used as a replacement?
• In a two-stage gas valve system, what is the firing rate during the second stage?
• How often should a gas lamp be cleaned?
• The prime component of a building as a system is what?
• What is the Total System Input in Btuh?
• What is the purpose of a low-water cutoff switch?
• Which heat transfer mode can operate without any physical medium between source and destination?
• What is the vent size for a 120 MBtu/h appliance with three elbows?
• Which standard specifies relief valve requirements for cylinders?
• Which of the following is not a listed appliance input calculation result?
• What is the measuring element on a direct-operated regulator?
• Which differential temperature is specified for safety when a heat exchanger reaches an unsafe temperature?
• Which statement best describes the role of the mechanical system in a building?
• Ventilation air inlet requirement for category one appliances located mid - point between any two appliances.
• What risk can occur if the anticipator in a thermostat is bypassed at the gas valve?
• A relay is a magnetically-operated switch that operates on which principle?
• The low gas-pressure switch opens when gas pressure falls to what fraction of the regulator setpoint?
• What is the minimum distance between a moisture exhaust duct and a service regulator?
• Before bypassing, what should be done?
• Which device among the listed has the smallest input rate?
• How long should a gas range operate before calibrating the oven temperature control?
• Which control system sequences the safe light-up of the burner system when safe conditions are indicated by limit controls?
• Which device is designed to control large amounts of current with large-load contacts?
• In a heat transfer path from boiler to room, which description accurately reflects the modes involved?
• The term 'Trial For Ignition' refers to what?
• When sizing air supply openings using the total input of all appliances, which table applies?
• In which type of boiler would you expect to find a flow switch?
• Between the first-stage and second-stage regulator, the listed propane vapour pressure limit is given as which of the following values?
• Building with improper insulation levels could contribute to which outcome?
• Maintaining sealed air boundaries primarily serves what purpose?
• Another liquid withdrawal method uses what connection?
• Which code clause governs the minimum duct size for air supply ducts in this context?
• Which value is the second lowest maximum vapour pressure on the list?
• Which of the following is a closing force in a pressure regulator?
• Which of the following is listed as a potential energy efficiency measure?
• Which statement best describes a hazard associated with pressure-induced backdrafting?
• Liquid withdrawal on a propane tank uses which thread?
• Where are thermocouples commonly used in safety systems?
• How many distinct combustion/dilution air inlet sizes are listed for an appliance with a draft hood and input of 185,000 BTUH?
• Which of the following is NOT listed as an agency for propane specifications?
• What is the major factor when determining the location of a combi unit?
• Wet and dry bulb temperatures are used to determine which property?
• Which device is used to prevent overheating by detecting an over-temperature condition and then cutting fuel supply?
• What is the maximum approved hose length for a gas-fired barbecue using a piezo ignition?
• What percentage reduction occurs when three 90-degree elbows are used?
• Which system is explicitly listed as a building code requirement for new homes?
• Where are effective vapour barriers normally installed?
• Which practice best reduces the risk of backdraft when using gas appliances in a building?
• Air infiltration levels in a building can be influenced by multiple factors. Which statement accurately reflects this?
• What is the primary purpose of a ground fault circuit interrupter (GFCI)?
• Which heat transfer mechanism can transfer energy across a vacuum without a medium?
• The building as a system approach means understanding how ___________ is affected by occupants, the building and the outside environment.
• If the main disconnect switch is closed, how do the components behave?
• What is the maximum propane vapour pressure limit between first-stage and second-stage regulators as listed in the standard?
• In a common chimney venting arrangement, which placement is correct for gas-fired and liquid-fuel appliances?
• A magnehelic gauge can be used to measure which of the following in a structure?
• Low water cut off is required on a steam boiler when the input rating exceeds how many Btu per hour?
• How are most service regulators classified?
• Which standard is another relief valve requirement for cylinders?
• As more occupants enter a room, relative humidity levels do what?
• Thermostats should be located how far from the floor?
• All regulators should be certified and properly sized to provide the required flow across the extremes of inlet pressures.
• A gas meter bypass should be used primarily to
• Maximum size of job fabricated welded fitting on a ten inch supply header
• Which of the following is described as a traditional framing method in the material?
• In a closed hydronic system, what effect does increasing system pressure have on the boiling point of water?
• What is the purpose of a regulator?
• Which action would be least effective in limiting stack effect?
• Which value is the second-highest listed maximum vapour pressure for recreation vehicles?
• Which fill level is considered a standard maximum for liquid propane in a cylinder?
• Which statement correctly describes the purpose of T & P valve operation?
• When converting an appliance from natural gas to propane, how should the orifice size change?
• Which option is not a cost-effective measure to decrease fuel costs according to the material?
• For an appliance without a draft hood and an input of 235,000 BTUH, the combustion/dilution air inlet size is which of the following?
• Which term indicates high pressure usage for a low capacity regulator?
• What is the maximum gas pressure allowed in an assembly building?
• Vapour barriers are designed to prevent moisture from leaving the interior. Which of the following best matches this statement?
• Vent size adjustment for three 90 degree elbows
• What is an electric meter?
• A system regulator bypass may be performed for which of the following reasons?
• Maximum number of 100 pound propane cylinders on a construction site?
• Which component uses the combined effects of temperature change and electricity and consists of a bimetallic strip joined at one end?
• Which code number is associated with the second listing of code covering installation of propane appliances on vehicles?
• BX cable is best described as which of the following?
• Lack of makeup air causes which of the following?
• Which of the following is the required air supply opening for 3 boilers?
• Between which two components is a minimum clearance specified to avoid moisture-related issues?
• Under which circumstances should a propane cylinder be purged?
• In mechanical air supply scenarios, into which circuit should the air flow sensing device be wired?
• Effective vapour barriers are normally installed on which side of insulation?
• A power venter certified for use as an add-on to a water heater may be used on a water heater with an input of which Btuh?
• Smallest permitted dimension for an air supply duct according to B149.1 Code, Clause 8.3.2.
• Which statement best captures multiple possible causes of a hot water complaint?
• Which of the following protects against current flow to ground?
• Armoured cable is commonly referred to as BX. What does BX stand for?
• Which outdoor air opening size corresponds to a draft hood appliance with an input of 125,000 Btu/h in the specified airtight enclosure?
• In a thermocouple open circuit test, which statement best describes the required condition for a valid reading?
• Which is a typical relief valve setting for a propane tank?
• What effect can an excessive number of lava rocks or briquettes have on a barbecue's burner?
• In permanent propane installation requirements, which statement about regulators between tank and appliance is correct?
• If an appliance regulator is defective, what is a possible consequence?
• How long should a gas range operate before calibrating the oven temperature control?
• What is a likely cause of a cold house when the boiler water is hot and the circulating pump motor is operating?
• Which device prevents the hydronic system from overheating by shutting off the burner at a high temperature?
• When heat can be transferred by more than one mode in a heating system, which combination best describes this scenario?
• Which statement describes appliances not required to vent to a chimney?
• Where must the vent diameter increase take place for a regulator with internal relief if the vent line extends beyond 50 ft (15 m)?
• According to the electrical code, where must wire connections be made?
• Which of the following describes a feature of some Honeywell fan/limit control switches?
• Which statement about stack effect is true?
• Gas billing is primarily based on the amount of gas consumed over a period. Which option expresses that concept?
• Which is a permanent propane installation requirement involving safety devices at the appliance?
• Method of testing gas pipe
• The vent connector material must have corrosion resistance equivalent to which standard?
• Which statement about the main switch's role is accurate?
• What is a permissible minimum distance for a tank over 1000 USWG from the property line, adjacent concrete or masonry building wall with no openings within the specified clearances, or a source of ignition?
• Type B vent may be used on furnaces equipped with which feature?
• An inline ammeter is connected across the component to measure current draw. Where is it placed?
• Where is an overpressure or line relief device located upstream of the regulator?
• Which copper tubing option is acceptable for underground service?
• Which type of regulator on a propane barbecue is non adjustable?
• What does a combustion safety control monitor to determine whether gas should be allowed to flow?
• What is the minimum dimension for fixed louver or grille apertures?
• How can an exhaust fan affect gas appliance operation?
• Relief valve communication in propane cylinder shall have direct communication with which spaces at all times?
• Backdrafting risk is influenced by which condition?
• What is the purpose of the main switch?
• Which of the following is a listed cause of cold house with hot boiler water and circulating pump running?
• Which insulation material color is commonly specified in modern codes as pink fiberglass insulation?
• What characterizes a digital programmable thermostat?
• In permanent propane installation requirements, which statement is true?
• Which area is typically prioritized for sealing to improve energy efficiency?
• In regulator terminology, which pressure is commonly referred to as the downstream or outlet pressure?
• Which device interrupts current when overload occurs?
• Which wire type is correct for metal studs?
• Which statement correctly describes makeup air in relation to building pressure?
• Piping on vehicles must be sized, tested and purged in accordance with which code?
• What type of current is conducted through the flame when voltage is applied between two flame rods?
• Which option best describes the normal pilot flame characteristics?
• Which area is one of the most important to seal against air leakage to improve energy efficiency?
• Combustion and dilution air requirements are normally supplied by
• In the B149.1 Code, which table is used for non-air tight structures for appliances having draft control?
• If the test dial reads 3 cubic feet in 15 seconds, what Btuh value does this correspond to?
• Which orientation should be avoided when shipping a gas meter?
• A line pressure regulator in a gas system must include which protection device?
• Which of the following is a listed open-circuit reading for thermocouples?
• Which wire gauge has the smallest diameter in the listed data?
• What is the High Pressure Total Input in Btuh?
• Which statement describes a Thermopile?
• Outdoor air supply is not required for a single water heater when the input is up to 40,000 BTUH. True or False?
• Which of the following statements about the maximum vapour pressures is true?
• If you have appliances with draft control devices and appliances without draft control devices in an air tight structure or enclosure, what tables are used to size air supply openings to the outdoors?
• Where is gas that has passed the regulator located?
• For an appliance with an input of 110,000 BTUH, what is the minimum vent distance from a non mechanical air supply?
• Vent size for 120 MBtu/h appliance with 5 ft lateral connector
• What fitting is required when a vent connector enters a lined masonry chimney?
• What is the common thermocouple output value for both open-circuit and closed-circuit configurations?
• Which device includes a pressure regulator as part of its assembly?
• Which of the following is listed as a construction method option in the material that is not balloon construction?
• What is the expected drop out voltage for a thermocouple?
• Purging gas lines
• What are wire conductors?
• A free-standing residential gas-fired range is characterized as which?
• Which of the following is a cylinder re-examination interval?
• What is the effect of winter ventilation on moisture in the air according to the material?
• Which value is listed as a differential pressure expressed in inches of water column?
• Which opening size is listed as 2 inches for 125,000 Btu/h appliances without a draft hood?
• Millivolt readings - Drop-out (another alternative)
• Draft hood installation location is described as which of the following?
• What is the isolation requirement for millivolt circuits?
• What is the function of an overpressure or line relief device downstream of the regulator?
• Which device prevents overpressure in a gas system?
• A high gas-pressure switch opens when gas pressure exceeds what threshold?
• Relief valve communication in propane cylinder must have direct communication with spaces which of the following?
• Which value represents a differential pressure drop of 1.0 inches of water column?
• Which of the following is the best option to prevent lime deposits?
• What does a pressuretrol sense?
• Which statement accurately describes lime deposit prevention?
• Which gas meter shipping position is NOT listed?
• Fans used to provide combustion air must be interlocked with which of the following?
• Which option is a representative size for a rectangle fresh air intake in square inches?
• Most residential lighting and appliances operate on which voltage?
• What is an advantage of control circuits on millivolts?
• What is the resistance reading across a closed contact?
• A masonry chimney venting a gas-fired appliance may not exceed the appliance capacity by more than what percentage?
• What does the notes specify about the rule of thumb pump sizing formula for water heater combination systems?
• How is an appliance vent connector attached to the draft hood or flue collar?
• What is a thermocouple?
• Which statement best describes the range of minimum water heater sizes listed for CSA-approved systems?
• Where are effective vapour barriers normally installed?
• Draft hood type gas fired appliances are susceptible to which problem?
• Which type of switch is used to transition a dryer motor from starting to running mode?
• What is the required side clearance from combustibles for a pendant type gas lamp?
• Schedule 80 piping requirement
• What is the maximum allowable over-sizing of a masonry chimney relative to the appliance it vents for a gas-fired appliance?
• Where should limit and operating controls be placed on schematic/ladder diagrams?
• The temperature rise across a water heater is defined as which of the following?
• As part of vaporizer system requirements, which adjustment is listed?
• In maintaining a water heating system, which method is recommended to prevent lime deposits?
• The sensing material for rod and tube water heater control valves can be composed of which?
• Control relays are electrically-operated switches that use electromagnets or solenoids to open and/or close several different circuits at the same time.
• What is another setting on a single stage propane regulator?
• Which statement best describes a valid vent line design for a pressure regulator?
• Which value is the largest among the listed Btuh values?
• Which device is designed to interrupt current in the event of a ground fault?
• Which value is listed as another propane vapour pressure value?
• Liquid propane piping
• Ventilation air brought into a building in winter will
• Which of the following is a valid factor in determining the outdoor air supply opening for draft-control appliances?
• What is the combined purpose of the two-stage regulator system?
• What is the equivalent length of a four inch forged tee?
• Where should the lower air supply opening be located relative to the floor?
• Where are effective vapour barriers normally installed?
• What is a stated purpose for a gas meter bypass?
• Which type of regulator is described as having an internal lock-off mechanism?
• Upper openings location: where should they be located relative to the room's ceiling and draft control device?
• Which pressure is the pressure on the gas side after the regulator?
• A magnehelic gauge measures which parameter in a building's air system?
• What size conductor is required to bond gas piping systems to the building's electrical system grounding conductor such as a cold water pipe?
• Which statement about conductor resistance and length is true?
• Who determines the dip tube length for a water heater system?
• A vaporizer in a propane system is required to:
• In sizing outdoor air openings, what is the key distinction between appliances with draft control devices and those without?
• Which device is typically used as an operating safety control to prevent unsafe pressure conditions?
• What is the function of a draft hood on an atmospheric furnace?
• Which of the following is a relief valve requirement standard other than CAN/TSSA-B340?
• True or False: For draft-control appliances, the outdoor air supply opening is determined by the combined input.
• On which type of gas-fired equipment would you typically find a rod and tube sensing device?
• The input rate of each furnace is.
• Which term describes the end of a thermocouple connected to the sensing element?
• A line pressure regulator must be of the positive shut-off type when the inlet supply pressure exceeds which threshold?
• Which device measures energy consumption?
• Which type of regulator is described as having an internal lock-off mechanism?
• Which conversion is correct for 20 L/s to CFM?
• When drawing schematic/ladder diagrams where should you place limit and operating controls?
• Which statement about air infiltration levels in a building is true?
• The windward side of a building will normally experience which type of pressure?
• Which statement best describes the impact of negative pressure on draft hood appliances?
• A domestic gas dryer exhaust duct must be secured using how many sheet metal screws?
• What is the effect of an anticipator set too low on heating system?
• Can a gas-fired appliance and a liquid-fuel-fired appliance be vented into a common chimney, and if so, how are the vents arranged?
• Which device provides protection against overpressure for a line regulator?
• What is the minimum distance plastic piping or tubing must be installed under a commercial parking lot?
• What term describes the difference between the OFF and ON operating temperatures associated with the aquastat?
• In a heat exchanger, what differential triggers an unsafe temperature condition?
• Outdoor air supply opening size for appliances without a draft hood and input of 125,000 Btu/h.
• Which statement about filtration in a building's HVAC system is true?
• How is 240 volts obtained for a residential 240 volt air conditioner from a residential service panel?
• Where should a GFCI receptacle be reset?
• Where should the upper air supply openings be located within the space?
• Which option is NOT listed as a susceptibility for draft hood type gas-fired appliances in the material?
• Which organization is associated with propane cylinder specifications in the set of agencies?
• Which option represents a common maximum liquid-fill percentage for propane in a cylinder?
• What is the minimum distance above a flat roof that a vent must terminate?
• Ventilation air inlet requirement for category one appliances located between 6\" - 18\" from the floor.
• Which term is described as a thermocouple related item that is not a junction type?
• Which regulator type is NOT listed as having an internal lock-off mechanism in the material?
• Which item is listed as a potential problem with a thermocouple?
• Barbeque ignition methods can include which of the following?
• If HW supply temperature is 135°F and CW incoming temperature is 55°F, what is the temperature rise?
• Which statement about #14 AWG copper wire is true when compared to #14 AWG aluminum wire?
• What is the required pipe size for section D?
• Which of the following lengths is a listed maximum for a metal connector for a suspended heater?
• Which statement best describes a drop-out test for a thermocouple pilotstat coil?
• Which is a permanent propane installation requirement about regulator stages?
• In a gas safety system, which component is the electromagnet in the pilotstat?
• Which device shuts down the boiler when water is too low?
• What is the best method of ventilating a structure?
• Which type of regulator on a propane barbecue is low level adjustable?
• For venting, a gas-fired appliance should be located as close as practicable to which feature?
• Outdoor air supply opening required for appliances without a draft hood and input of 125,000 Btu/h.
• For a CSA-approved combination system, what is the minimum water heater size?
• If a heat loss calculation determines heat loss is 100,000 Btu/h, what size furnace should be installed?
• Where should a vent connector size change location be made?
• Which action increases downstream pressure?
• Which statement describes the function of a low water cutoff?
• Within how many seconds must the thermocouple cool and de-energize the safety shut-off valve after a flame failure?
• What is the millivolt reading for open-circuit thermocouple measurement?
• How is the anticipator wired in regards to gas valve and thermostat contacts?
• The flame enveloping distance of 3/8 to 1/2 inch corresponds to how many millimeters?
• During a service call for a pilot outage, if a thermocouple shows an open circuit reading of 30 mV, a closed circuit reading of 15 mV, and a dropout of 2 mV, what action is indicated?
• Which statement correctly describes vent termination distance from a service regulator?
• Another gas meter test dial purpose
• If HW supply temperature is 160°F and CW incoming is 100°F, the rise is:
• What happens to relative humidity when the indoor air is heated?
• A voltmeter is connected across or in parallel with the component to measure voltage drop. Where is it connected?
• Which vent diameter is common to both a 5 ft lateral single-wall metal vent and a chimney with a corrugated liner?
• How are operating controls shown on schematic diagrams?
• Which agency for propane specifications is listed first in the given list?
• What happens to the resistance of a conductor as its length increases?
• For appliances with draft control, the outdoor air supply opening should be considered based on the combined input.
• In CSA Mod 22 reference, how is capacity determined for a 10 ft height and 5 ft lateral?
• The minimum aperture size of a combustion air inlet screen is
• Which statement correctly describes a domestic hot water appliance installed in an isolated enclosure?
• If the main disconnect switch is open with a call for heat, how do the components behave?
• During lighting a barbecue, what position should the lid be in?
• What is the closed circuit output of a thermocouple?
• Which factor most directly increases thermal resistance of a building component?
• Which statement correctly describes outdoor air supply openings for appliances with draft control?
• Which statement best describes the overall purpose of the two-stage regulator system?
• Which device is similar to a relay but contains large-load contacts designed to control large amounts of current?
• In the B149.1 Code, which tables cover outdoor air supply sizing for non-air tight structures?
• Another gas meter shipping position requirement
• Indication of high pressure usage for a low capacity regulator corresponds to which term?
• Which item is a factor to consider when selecting the correct gas regulator?
• What is the relief valve setting on a propane cylinder?
• Where are air filters usually located?
• When does a low gas-pressure switch open?
• Which type of regulator is described as having an internal lock-off mechanism?
• Clause 8.3 governs outdoor air supply openings for loads above which rating?
• What is the input rate of the duct furnace?
• An appliance without a draft control device and an input of 200,000 Btu/h is installed in an enclosure or structure that is air tight - What is the outdoor air supply opening required?
• Which component allows isolation of the regulator for maintenance?
• Which statement describes a Thermopile?
• What is the required vent diameter when three elbows are used?
• Who determines the dip tube length for a water heater?
• Which heat transfer mechanism requires a moving fluid to carry energy from one place to another?
• What is the required pipe size for section E?
• Which condition is likely caused by negative pressure in a building affecting draft hood appliances?
• Which statement about draft hood appliances under negative pressure is true?
• Which component operates on the principle of being a semi-conductor and is commonly used as a simple rectifier in control circuits?
• What is the required pipe size for section C?
• What is the highest maximum vapour pressure listed?
• Which term describes a junction associated with micro currents in thermocouple applications?
• Which device is an example of an operating safety control?
• Thermostats used in the heating industry can be rated for which voltage categories?
• An appliance with a draft hood and an input of 100,000 Btu/h is installed in a building that has an equivalent leakage area of 0.05 m2 at a differential of 10 Pa - What is the outdoor air supply opening required?
• Draft hood type gas fired appliances are susceptible to which problem?
• Switch rating is determined by what?
• What capability do certain Honeywell fan/limit control switches have?
• Air-supply openings shall not be located within how many feet of a moisture exhaust duct?
• What is the function of the temperature and pressure relief valve (T&P valve) on a storage tank?
• Which millivolt reading corresponds to 'Open circuit (another alternative)'?
• What type of vent is required for a combination oil/gas fired appliance?
• Combustion air provided from inside the building is replaced by which of the following?
• Which statements are acceptable for filling a propane cylinder?
• Which of the following scenarios yields an outdoor air opening of 36 sq in?
• What is the pressure relief valve setting on a propane cylinder?
• What is the delivery pressure of the regulator?
• Which device senses steam pressure?
• Smallest permitted dimension for an air supply duct according to B149.1 Code, Clause 8.3.2.
• Draft hood installation is permitted under which condition?
• Which statement best describes a free-standing residential gas-fired range?
• Which statement about ventilation air inlet requirements for direct vent appliances is true?
• Which scenario is described by the thermocouple pilotstat coil test?
• Which statement best describes orifice sizing when converting from natural gas to propane?
• Which of the following is a technique used to enhance moisture control in building envelopes?
• Which statement best describes the mantle's effect on flame color?
• What is the minimum size in square inches for a rectangle fresh air intake?
• If a building is under negative pressure, which issue is commonly observed with draft hood appliances?
• Thermostat terminals associated with the heating circuit of a gas-fired furnace are:
• Which component provides high temperature limit control for the burner and plenum temperature control of the air circulating fan motor?
• Which statement describes the thermocouple pilotstat coil test?
• Which of the following is the required air supply opening for 1 boiler?
• Which component is described as controlling the operation of electrical circuits?
• Which is the lowest propane vapour pressure value listed in the data?
• What is the maximum number of cylinders?
• Which device generates a voltage when its junctions are heated?
• The windward side of a building will normally experience which pressure condition?
• What is the free area of the upper opening in the combustion and ventilation air openings size examples?
• Which control system takes the command away from the operating controls when continued operation would cause an unsafe situation?
• Which statement best describes the advantage of a circuit breaker over a glass plug fuse?
• Which statement accurately describes the difference between direct current (DC) and alternating current (AC)?
• Modern building contractors normally build using
• What is the function of the Honeywell fan/limit control switch?
• In duct installation, what is the role of wire mesh?
• Air leakage is most likely to occur how?
• Which regulator usage is indicated for the third example of high pressure usage with a low capacity regulator?
• Which statement is most accurate about heat transfer modes in typical heating systems?
• What type of valve is used on oxy-acetylene hoses to prevent backflow?
• If a domestic clothes dryer is not drying properly even with a clean lint screen, what is a common cause?
• Which of the following is not a standard maximum fill level for liquid propane in a cylinder?
• Which withdrawal method uses a standard water pipe fitting?
• Which of the following actions would best reduce heat loss caused by air leakage?
• Probe and float type low water cut off switches are considered to be
• Which statement about vent lines on storage tanks is correct?
• Which type of regulator on a propane barbecue is fully adjustable?
• A gas meter should be shipped in which orientation to minimize damage?
• What is the vent diameter specified for a 5 ft lateral single-wall metal vent?
• Tables 8.3 - appliances having draft control or Table 8.4 - appliances not having draft control are used to size outdoor air supply for non-air tight structures.
• Among the following, which describes a typical mechanical combustion air intake requirement?
• What unit is used to express the system input values?
• Which action best reduces energy loss due to air leakage?
• Copper tubing used for underground service shall be?
• Which value is the lowest maximum vapour pressure on the list?
• A thermocouple consists of what element at one end?
• In wiring diagrams, what does 'at rest' indicate?
• Which statement best describes a true property of a mechanical combustion air intake arrangement?
• Which code number is associated with the first listing of code covering installation of propane appliances on vehicles?
• A low water cutoff is required when the boiler input is less than 400,000 Btuh and which condition is present?
• Which formula corresponds to 1 gpm per 1,000 BTUH input?
• Circuit breaker terminal types vary how?
• What is the most effective method to prevent lime deposits in a water heating system?
• Which formula is used for pump sizing in water heater combos, as listed in the second rule?
• For an appliance without a draft hood and 235,000 BTUH, what is the smallest listed combustion/dilution air inlet size?
• For direct vent appliances, which statement best describes the location of the ventilation air inlet?
• What term describes the resistance to heat flow through a boundary or material?
• Which statement best reflects a common characteristic of vapour barriers as described?
• What is a common setting for a high-limit aquastat?
• Refillable cylinder manufacturing requirements are in accordance with CAN/CSA-B339 and which Transport Canada regulation?
• If manifold pressure is improper, what is a possible outcome?
• What function does a fire stop serve when installed with a B vent system used as a common vent?
• Draft hood type gas fired appliances are susceptible to which problem?
• Which device protects against low water by measuring water level and shutting down the boiler when it falls low?
• Which statement about direct vent ventilation inlet requirements is false?
• Gas appliances combustion safety requires which of the following?
• Which feature must be installed upstream of a line pressure regulator?
• Head pressure is measured in which unit?
• What distance must the flame envelop on the thermocouple tip?
• What draft device is required for an incinerator?
• What is the acceptable round air supply duct size?
• An appliance with a draft control device and an appliance without a draft control device with a combined input of 300,000 Btu/h are installed in an enclosure that is air tight. What is the outdoor air supply opening required?
• Which clause is used to size openings in enclosures?
• Another requirement for a vaporizer in a propane system is to:
• Which of the following can cause elevated CO2 levels in a house?
• What is the minimum top clearance from combustibles for a domestic gas range?
• Which are the two basic types of LWCO switches?
• What is required for venting of a pressure regulator to ensure safety?
• Which option corresponds to a valid minimum rectangle fresh air intake size?
• Which feature is required on the vent line of a pressure regulator?
• What filling methods are acceptable for a propane cylinder?
• Under which conditions should a propane cylinder be purged?
• What is the result of the second appliance input calculation?
• Condensation of water vapour in combustion products or flue gases occurs under certain boiler designs.
• Which device distributes electrical power to various circuits?
• What is the minimum aperture size for a combustion air inlet screen?
• What is the maximum vapour pressure in recreation vehicles?
• In a hydronic heating system, what is the primary purpose of a low water cutoff?
• Control relays are designed to open and/or close several circuits at the same time using which mechanism?
• Infrared scanner cell material used in the system is which of the following?
• Which aspects of gas meter usage are considered for billing and safety?
• Which action increases downstream pressure in a regulator system?
• Type 'L' vent usage may be used in lieu of which vent types?
• Which option places Upstream pressure as the closing force at the last position?
• From a natural gas meter test dial, a half cubic foot in 20 seconds corresponds to which appliance input value?
• Which is the largest minimum water heater size listed for a CSA-approved combination system?
• Draft hood type gas fired appliances are susceptible to which problem?
• Exfiltration air leaving the building is a replacement for combustion air provided from inside. Which option reflects that replacement?
• Millivolt readings - Drop-out (alternative)
• What is the minimum distance in feet between a propane tank and the property line for tanks over 5000 USWG if no minimum distance is specified?
• Which statement describes AWG 18?
• What voltage is expected across the primary side of a 120/24V step-down transformer?
• Where should the T&P valve be located within the storage tank?
• Which is the highest propane vapour pressure value listed in the data?
• What is the maximum length of a corrugated metal connector for a gas range?
• What does Btuh stand for?
• What is the primary function of vapour barriers according to the material?
• Air leakage is more likely to occur through which areas?
• Which of the following could be a minimum rectangle fresh air intake size?
• Which statement about gas dryer venting is correct?
• What is the free area of the lower opening in the combustion and ventilation air openings size examples?
• What is the required size of the outdoor air supply opening for 400,000 Btu/h?
• What should be done to the orifice size when converting an appliance from natural gas to propane?
• What is the required pipe size for section B?
• The hydrostatic relief valve is used on which line to release excessive pressure caused by trapped liquid natural gas?
• Which statement describes devices that impair combustion or venting?
• Plug fuses are also known as screw-base or Edison-base fuses. Type P is used in standard applications. What does type D stand for and where would it be used?
• Which regulator type is designed to include a lock-off feature to prevent gas flow when disconnected?
• In the combustion and ventilation air openings size examples, which of the following is a listed lower opening free area?
• What wire type is most appropriate for metal studs?
• Which of the following is not a listed potential cause of spillage?
• Which of the following represents the maximum number of cylinders?
• Which combination is used to determine humidity in HVAC practice?
• What is the expected voltage output range for a thermopile or powerpile?
• Which value is not listed as a differential pressure value in the data?
• An appliance with a draft hood and an input of 325,000 Btu/h is installed in a structure that has an equivalent leakage area of 0.05 m2 at a differential of 10 Pa - What is the outdoor air supply opening required?
• If a cylinder is filled to 100% liquid, what risk increases?
• Lack of makeup air can be the result of which of the following?
• Which device has contacts rated for light duty and typically carries only small currents?
• The code requires that a mechanical combustion air intake be interlocked with which component?
• Which gases are used by a welder for cutting steel pipe?
• What tables in the B149.1 Code are used to size an outdoor air supply to an enclosure or structure that is air tight?
• Which formula is correct according to the rule of thumb pump sizing for water heater combo systems?
• If spillage occurs in a draft hood appliance, what does this indicate about the chimney condition?
• Which statement describes a plausible arrangement for a mechanical combustion air intake?
• An appliance requiring venting shall be located as close as practicable to which feature?
• What is the maximum liquid-fill percentage for propane in a cylinder?
• What must be used in the capillary tube for high temperature sensing control elements?
• For an appliance with a draft hood and an input of 185,000 BTUH, what is the combustion/dilution air inlet size?
• What is the required shipping position for a gas meter?
• What tables in the B149.1 Code are used to size air supply to an enclosure or structure that has an equivalent leakage area of 0.05 m2 at a differential of 10 Pa?
• Air from the kitchen area can replace combustion air provided from inside. Which option shows this replacement?
• Vent capacity for 5 inch diameter vent
• Which instrument measures voltage in a circuit?
• How are limit controls shown on schematic diagrams?
• Maximum size welded fitting on ten inch header
• Which action increases downstream pressure by turning the regulator spring clockwise?
• Which pump sizing formula yields 10 gpm per 10,000 BTUH input?
• The radiator can emit heat directly to objects in the room without touching them by which mechanism?
• What is the base capacity of a 6-inch vent before the reduction?
• Which is a permanent propane installation requirement?
• Which feature is required on a propane cylinder used on a construction site?
• An appliance vent located on a flat roof is 4 feet away from a new addition which extends 6 feet above a flat roof. The minimum vent height for the new vent will be:
• What tables in the B149.1 Code are used to size air supply to an enclosure or structure that complies with clause 8.2.1 (a) or (b)?
• Which test is used to verify the millivoltage at which the pilotstat coil no longer holds the valve open?
• What is the anticipator in a mechanical thermostat designed to do?
• Which is a permanent propane installation requirement about regulator stages?
• What is the maximum approved hose length for a gas-fired barbecue using a standing pilot?
• Which feature is used in a liquid withdrawal method on a propane cylinder?
• Which of the following is NOT an example of a limit or safety controller?
• Indication of high pressure usage for a low capacity regulator corresponds to which term?
• Which of the following is a potential problem cited for thermocouple issues?
• What is the differential or pressure drop across a diaphragm gas meter?
• In a liquid withdrawal method, which connector is used?
• How is excessive downstream pressure controlled by a service regulator?
• What is the calculation for the capacity of a 5-inch vent after applying the 10% reduction, given a base capacity of 122 MBtu/h?
• Which pilot type is automatically lighted each time there is a call for heat?
• Metal screws are described as which method for securing duct sections?
• Heat loss in a residential building is greatest through which element?
• What does an electric utility meter record?
• What is the time range for operating a gas range before calibrating the oven?
• Which statement best describes the relationship between appliance input and the required outdoor air opening for draft hood appliances in an airtight structure?
• What is the minimum water heater size recommended for a CSA-approved combination system?
• For propane conversion, the orifice size is typically
• What is the standard unit of measurement used to express appliance input in Btuh?
• Which statement correctly describes the thermistor's behavior as temperature rises?
• What component ensures there is adequate flow to prevent damage by shutting down boiler operation when flow is too low?
• When a relay labeled CR is energized, what will occur?
• To reduce heat loss through infiltration, which action is appropriate?
• Which component uses the combined effects of temperature change and electricity and involves a bimetallic strip joined at one end?
• What is the standard voltage drop across a closed switch under normal conditions?
• Which statement is true about bathroom exhaust fans?
• Millivolt readings - Drop-out (alternative)
• What is required on the vent line of a pressure regulator?
• Temperature rise across a water heater is defined as the difference between which two temperatures?
• What occurs in the stacking effect within a water heater storage tank?
• Exfiltration air leaving the building as replacement air is an example of replacement air for combustion from inside. Which option shows this?
• Head pressure in a piping system refers to which concept?
• Maximum length of a metal connector for a suspended heater
• Gas piping can be used as a ground only as part of a flame safeguard circuit.
• Which wire gauge is listed as carrying the most current?
• Flue and ventilation effect in a building refers to which phenomenon?
• If a regulator is bypassed, what is a likely consequence?
• Which code number is associated with the third listing of code covering installation of propane appliances on vehicles?
• If HW supply temp is 100°F and CW incoming temp is 40°F, the temperature rise is:
• In gas meter terminology, which term describes measuring the flow of gas through the meter over time?
• Air from the kitchen area can replace combustion air provided from inside. Which option shows this replacement?
• When water heaters are installed in parallel, what device is installed to ensure equal water flow through the heaters?
• Thermostat cycling frequency: For best results, how many times per hour should the furnace cycle?
• Which organization determines specifications for propane cylinders?
• Which of the following is a differential or pressure drop value?
• Which issue could cause a cold house with hot boiler water and circulating pump running due to a safety switch?
• Which construction option is identified as a modern method of framing in the material?
• Which method is appropriate to attach a vent connector to the draft hood or flue collar?
• Which of the following is a listed appliance input calculation value?
• Which term is related to thermocouples but not specifically defined?
• Where must the lower air supply openings be located in the enclosure?
• What is the vent diameter specified for a chimney with corrugated liner?
• Which outdoor air opening size is listed as 9 inches for 125,000 Btu/h appliances without a draft hood?
• LER for High Pressure side equals which value?
• What is the input rate of each furnace?
• Which heat transfer mechanism involves energy transfer through direct contact between molecules in a solid?
• Two-stage regulator system helps maintain gas pressure as tank pressure changes. Which statement is true?
• How should the thermocouple combustion safety control connection to the gas valve be tightened?
• Which of the following is a cylinder re-examination interval?
• Which statement about venting gas dryers is correct?
• A hot water boiler requires a low water cutoff when the boiler input is below a safety threshold. Which condition mandates a low water cutoff?
• The building envelope is best described as which of the following?
• Which value correctly represents the boiler rating for a single-family dwelling?
• What is an atmospheric vent on a direct-operated regulator?
• Which statement describes the temperature rise calculation?
• What is a primary purpose of purging a propane cylinder before filling?