Gas Technician 2 (G2) License Practice Exam

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Gas Technician 2 (G2) License Practice Exam 2026 – Your All-in-One Guide to Certification Success! course image
Choosing the Right Duct Size for Your Heating SystemWhen designing an air duct system for heating, what size duct would provide adequate airflow for a blower rated at 1400 CFM?Direct Current Travels in One DirectionHow does direct current (DC) travel?Discovering Safety Protocols for Operating a Steam Boiler BurnerIf a Steam Boiler Burner is operational and the Water Gauge glass shows no water, what is the immediate action required?Discovering the Flame Temperature for Natural GasWhat is the flame temperature for Natural Gas?Discovering the Voltage Range of Electronic Air CleanersWhat is the approximate secondary voltage range of an electronic air cleaner?Essential Factors to Consider for Operating a Bypass HumidifierWhat must be considered when operating a bypass humidifier?Essential Tips for Preventing Electrical Shock in Wet ConditionsWhat should be observed to prevent shock in wet conditions?Exploring the Best Piping for Gas DistributionWhat type of piping is commonly used for gas distribution in residential and commercial applications?How a High Limit Aquastat Ensures Safety in Your Heating SystemWhat is the primary safety feature of a High Limit Aquastat?How a Voltmeter Measures Potential Difference in Electrical CircuitsThe instrument used to measure Potential Difference in an Electrical Circuit is called a?How does a Ground Fault Circuit Interrupter work to prevent electrical shocks?What type of electrical anomalies can a Ground Fault Circuit Interrupter prevent?How Flue Gases Work in a Steel Fire Tube BoilerIn a Steel Fire Tube Boiler, how do the flue gases interact with the water?How Insufficient Air Flow Creates Excessive Ozone in Air SystemsHow are excessive levels of ozone produced in air systems?How to Calculate Capacitance When Capacitors are Connected in ParallelWhen two capacitors are connected in parallel, how is their capacitance calculated?How to Determine the Right Duct Size for Your Propane FurnaceWhat size return air duct should be installed on a new propane fired Warm Air Furnace rated at 100 MBTUH with a blower moving 1400 CFM?How to Effectively Reduce Mold Growth in Your HomeWhat action is most effective in reducing mold growth in a house?How to Identify a Properly Functioning Gas Valve in Your Furnace SystemWhat is an immediate indicator of a properly functioning gas valve in a furnace system?Key Considerations for Using a Furnace as Temporary Heat in ConstructionWhat must be considered when using a furnace for temporary heat in a residence under construction?Minimum Allowable Distance from Water Heater Flue Outlet ExplainedWhat is the minimum allowable distance from a 50,000 BTUH water heater flue outlet to grade level?Navigating Natural Gas Service Regulators and Pressure DeliveriesA Natural Gas Service Regulator is normally set to deliver pressure from:The Importance of Proper Sizing for Gas Piping Branch OutletsWhat size must the branch outlet be when installing a 2" NPS piping system for future appliances?The Most Effective Way to Eliminate Odors from Your HomeWhat is the best method for removing odors from a house?Understanding analog meter scale selection for safe voltage measurementWhen checking a circuit of unknown Voltage using an analog meter, which scale should be selected for maximum range?Understanding Brazing Temperature for Metal JointsAt what temperature is a joint considered to be "brazed"?Understanding BTU Input and Its Role in Gas AppliancesWhat is the main factor in determining the size of air supply openings for gas appliances?Understanding BTUH: The Key to Efficient Water Heating SystemsWhat is indicated by the term 'BTUH' in the context of water heaters?Understanding Combustion Air Requirements for Your Furnace RoomWhat size opening is required in the furnace room door for combustion air in the described setup?Understanding Common Operating Pressures for Commercial Hot Water BoilersWhich of the following is a common operating pressure for commercial hot water boilers?Understanding Free Air Opening Requirements for BoilersIf 5 boilers with draft diverters are to be installed in a room with a volume of 15,000 Cubic Feet, what size of free air opening is required?Understanding Front Clearance Requirements for Commercial DryersWhat is the minimum front clearance required for a commercial type dryer from combustible materials?Understanding Frost Buildup in Cooling SystemsWhat occurs in the cooling mode if the prefilter of an electronic air cleaner gets plugged with dirt?Understanding Gas-Fired Refrigerators: What You Need to Know for Your G2 ExamWhich component is NOT typically found in a gas-fired refrigerator?Understanding Grill Size Requirements for Hot Water Boilers and Water HeatersHow large should the grill be for two hot water boilers and two water heaters firing at the specified BTUH in a contained room?Understanding Grill Size Requirements for Hot Water SystemsWhat is the required grill size for three hot water boilers firing at 500 MBTUH each, two hot water heaters firing at 270 MBTUH each, and a domestic water heater firing at 30 MBTUH, assuming 80% free air space?Understanding Heat Conduction in Solid MaterialsWhat does heat conduction refer to?Understanding Heating Systems and the Distribution EffectWhich heating system is likely to cause issues due to the "Distribution Effect"?Understanding High-Pressure Natural Gas Lines and Safety StandardsWhat is the pressure threshold that qualifies as a high-pressure line of natural gas?Understanding How Ambient Temperature Affects Thermistors in Heating SystemsWhich element influences the characteristics of a Thermistor in a heating system?Understanding how the ignition sensor functions in spark ignition dryersWhich device shuts off the Spark Igniter in a Spark Ignition Dryer after proper ignition?Understanding How to Correctly Connect a Voltmeter for Accurate ReadingsWhere should a voltmeter be connected when testing a device?Understanding how to determine a Heat Anticipator setting in a thermostatHow is the Heat Anticipator setting for a Thermostat determined?Understanding How to Test a Pressure Switch for DefectsHow is a pressure switch tested for defects?Understanding Humidity: How Room Temperature Affects Comfort LevelsIf the relative humidity of a room increases, what must be done to maintain the same comfort level?Understanding Inshot and Upshot Burners in Conversion SystemsWhat type of burner is utilized in conversion burners?Understanding Low Water Cut Off in Steam Boiler SafetyWhat protects a steam boiler if the condensate pump fails to return water to the boiler?Understanding Maximum Pressure Loss for Gas AppliancesWhat is the maximum pressure loss allowed between the termination of the utility installation and an appliance for a piping system with supply pressure exceeding 14" W.C.?Understanding Minimum Combustion Air Opening for Gas AppliancesWhat is the minimum combustion air opening size for an appliance without a draft hood and input of 125,000 BTUH in a tightly sealed structure?Understanding Optimal Static Pressure for Your Forced Air FurnaceWhat is the recommended external static pressure of a supply air plenum on a forced air furnace?Understanding Pictorial Diagrams for Gas TechniciansWhat does a pictorial diagram primarily show?Understanding Propane Cylinder Regulations for Safe Indoor UseWhen Propane is to be used in the construction repair or import of a building, how many 100lb cylinders may be manifolded together and used indoors?Understanding Propane Storage Limits at Construction SitesWhat is the maximum total quantity of propane that can be stored at construction sites?Understanding Relief Valve Settings for Low Pressure Hot Water SystemsThe relief valve for a low pressure hot water system should be set at:Understanding Residential Power Supply Requirements for Gas TechniciansWhat is the standard oncoming power supply to residential homes?Understanding Safety Hazards with Gas Piping SystemsWhich of the following scenarios might lead to a potential safety hazard when using gas piping?Understanding Safety in Boiler Rooms: The Importance of an Emergency Shut-Off ValveWhat is required in the Gas Supply Line to a Boiler Room when the total input exceeds 2,000,000 BTUH?Understanding Safety Measures for Gas Appliance Pressure AdjustmentsWhat safety measure should be taken when adjusting pressure on gas appliances?Understanding Supply Air Requirements for Domestic Heat PumpsIn domestic heat pump applications, what is the minimum volume of supply air (cfm) per ton of cooling required?Understanding the Activation of a Combination System BurnerA combination system burner is activated by what?Understanding the Best Fuse Types for Motor CircuitsWhich type of fuses are recommended for serving motor circuits?Understanding the Best Location for a Backflow Preventer in Boiler SystemsWhere should a backflow preventer be located in a boiler system?Understanding the Best Temperature for Your Residential Water HeaterAt what temperature are most residential water heaters set to operate?Understanding the Causes of Hydrogen Evolution in Water Heater TanksWhat causes hydrogen evolution in a water heater tank?Understanding the Characteristics of Globe ValvesWhat is a common characteristic of globe valves?Understanding the Chemical Formula of Acetylene: C2H2 ExplainedWhat is the chemical formula of acetylene?Understanding the Closing Force in Gas Pressure RegulatorsWhat does the Closing Force in a gas pressure regulator refer to?Understanding the Combination Air Ratio for Natural GasIf one cubic foot of Natural Gas is 1000 BTUH, what is the ratio of Combination Air?Understanding the Critical Role of ECOs in Water Heating SystemsWhich of the following best describes an ECO's function?Understanding the Diameter for a Single Wall Vent ConnectorWhat diameter is specified for a Single Wall Vent Connector for a single appliance with an input of 1,000,000 BTUH and other defined factors?Understanding the Distinctions Between Flame Types for Gas TechniciansA flame produced without premixing of primary air with gas prior to ignition is referred to as what?Understanding the Duct Requirements for Bypass HumidifiersHow many duct openings are required for a bypass humidifier?Understanding the Essential Safety Features in Storage Water HeatersWhat is required for all storage water heaters?Understanding the Essential Tool for Checking Electric Motor WindingsWhich tool is essential for checking if the windings on an electric motor have shorted?Understanding the Essentials of Sizing a Circulator Pump in Heating SystemsWhat information is essential for determining the size of a Circulator Pump in a Combination Heating System?Understanding the Explosion Limits for Propane GasWhat are the explosion limits for Propane Gas?Understanding the Factors Behind Branch Fuse Size in Gas SystemsWhat determines the Branch Fuse Size in a gas system?Understanding the Hissing Sound from Your Water HeaterWhat is the likely cause of an intermittent hissing sound resembling water dripping on something hot from a water heater?Understanding the Hydrostatic Pressure Relief Valve for Propane TanksIn propane tanks, the Hydrostatic Pressure Relief Valve must be set at a minimum of:Understanding the Ideal Return Water Temperature for Efficient Burner ActivationIn a combination system utilizing a water heater for domestic hot water, the temperature of the water returning from the heating loop must be:Understanding the Ignition Temperature for Natural GasWhat is the ignition temperature for Natural Gas?Understanding the ignition temperature of propane gasWhat is the ignition temperature for Propane Gas?Understanding the Impact of Improperly Sized Combustion Air OpeningsWhat is the potential consequence of improper sizing of combustion air openings?Understanding the Importance of Backflow Preventers in Fuel Gas SystemsWhat safety feature is essential for preventing backflow in a fuel gas system?Understanding the Importance of Bonding in Gas Piping SystemsIn gas piping, what does bonding ensure?Understanding the Importance of Checking Your High Limit Aquastat Settings AnnuallyHow often should the settings for the High Limit Aquastat be checked?Understanding the Importance of Dilution Air Ratio in Gas CombustionIf one cubic foot of Natural Gas is 1000 BTUH, what is the ratio of Dilution Air?Understanding the Importance of Head Pressure in Hot Water SystemsWhy is head pressure significant in hot water systems?Understanding the Importance of Hydrostatic Relief Valves in Propane SystemsWhat must be installed between two shut-off valves in a propane system?Understanding the Importance of Insulating Ducts for Your HVAC SystemWhat is the primary purpose of insulating the outside of a duct?Understanding the Importance of Isolating Millivolt Wiring from Line VoltageWhy should millivolt wiring be isolated from line voltage wiring?Understanding the Importance of Pressure Reducing ValvesWhat is the function of a Pressure Reducing Valve?Understanding the Importance of Pressure Relief Valves in Hot Water Heating SystemsWhat is the purpose of installing a pressure relief valve in hot water heating systems?Understanding the Importance of Purging Branch Supply Lines in Gas SystemsWhat is the consequence of not purging every branch supply line before use?Understanding the Importance of Upright Gas MetersGas Meters must be maintained in the Upright Position...Understanding the Key Components of a Copper Fin Tube Instantaneous Water HeaterWhich components are found in a copper fin tube instantaneous water heater?Understanding the Maximum Voltage Produced by ThermocouplesA thermocouple can produce a maximum of how much voltage?Understanding the Minimum Acceptable Closed Thermocouple ReadingWhat is the minimum acceptable closed thermocouple reading?Understanding the Minimum Allowable Working Pressure for Propane TanksWhat is the Minimum Allowable Working Pressure (MAWP) for a tank of propane?Understanding the Minimum Height for Furnace Installation in Repair GaragesWhat is the minimum height to install a furnace in a repair garage?Understanding the Minimum Service Clearance Requirement for BoilersWhat is the minimum service clearance vertical requirement for a Boiler?Understanding the Necessity of Low Water Cut Off Devices in Heating SystemsA low water cut off device on an automatically fired hot water heating boiler rated at 450,000 BTUH is:Understanding the Normal Fuse Rating for a #14 AWG Copper ConductorWhat is the normal fuse rating for a #14 AWG copper conductor?Understanding the Primary Configuration of Fire Tube BoilersWhat is the primary configuration of a Fire Tube Boiler?Understanding the Required Conductor Size for Bonding Gas PipingWhat size conductor is required to bond gas piping?Understanding the Risks of a Cracked Heat Exchanger in Your HVAC SystemWhat is the most likely cause of a service call reporting a combustion gas odor when the circulating blower activates?Understanding the Rod and Tube Sensing Method in Domestic Hot Water HeatersWhat sensing method is most commonly used in thermostatically controlled domestic hot water heaters?Understanding the Role of a Thermostat in Hydronic SystemsWhat device is essential for controlling temperature in a hydronic system?Understanding the Role of an Induced Draft Fan in Your FurnaceWhat is the purpose of an induced draft fan in a furnace?Understanding the Role of Backflow Preventers in Boiler SystemsA backflow preventer used in a boiler system should be located in the:Understanding the Role of DPDT Thermostat Controls in Multi-Stage HVAC SystemsWhat type of thermostat control is typically used for multi-stage HVAC systems?Understanding the Role of Gas Regulators in Safe Gas SystemsWhat is the primary function of a gas regulator?Understanding the Role of Low Limit Control in Hot Water SystemsWhat is the purpose of a low limit control in a combination system?Understanding the Role of Temperature Rise in Setting the External Bypass ValveThe external bypass valve is set by determining the:Understanding the Role of the Appliance Regulator in Gas SystemsName the regulator used in a combination gas valve to reduce the building gas pressure to the correct burner working pressure.Understanding the Role of the High Limit Switch in Natural Gas FurnacesWhich control mechanism shuts off the gas valve if the vent motor fails in a natural gas furnace?Understanding the Role of the Humidifier Motor and Humidistat in HVAC SystemsWhat is the primary function of the humidifier motor in relation to the humidistat?Understanding the Role of the Storage Tank Thermostat in Water HeatersWhat component controls the outlet temperature of a circulating water heater?Understanding the Role of the Thermostat in HVAC SystemsWhich component is primarily responsible for maintaining the desired temperature in an HVAC system?Understanding the Role of the Valve Disk in a Gas RegulatorWhat is the restricting element in a gas regulator?Understanding the Safe Procedure for Diluting Muriatic AcidWhen diluting Muriatic Acid with water, what is the recommended procedure?Understanding the Specific Gravity of Natural GasWhat is the specific gravity of natural gas?Understanding the Specific Gravity of Propane GasWhat is the specific gravity of propane gas?Understanding the Thermostat in No Heat Calls for Gas TechniciansIn a no heat call scenario, if the gas valve coil reads 0 volts and thermostat reads 24 volts, which component is likely open?Understanding the Typical Operating Pressure for Low-Pressure Steam BoilersWhat is the typical operating pressure for low-pressure steam boilers?Understanding the Vital Role of Gas Pressure RegulatorsWhat is the primary function of a gas pressure regulator?Understanding the Voltage Needs of Hot Surface IgnitersHow many volts are required for a Hot Surface Igniter to operate properly?Understanding Venting Area Requirements for Multiple AppliancesWhat is the requirement for the venting area when multiple appliances are connected to a Common Vent?Understanding Venting Regulations for Category 3 FurnacesWhat is the minimum distance that the vent from a 175,000 BTUH category 3 furnace may terminate from a door?Understanding Voltage: The Key to Current Flow through ResistanceWhat is the electrical potential difference that results in current flow through resistance?Understanding Water Flow Control in Heating CoilsHow is the flow rate of water through a heating coil in an air handler controlled?Understanding Where Air Filtration Devices Are Generally LocatedWhere are air filtration devices generally located?Understanding Where Vapour Barriers Should Be InstalledWhere should Vapour Barriers be installed?Understanding Why Natural Gas is Ideal for Residential HeatingWhich property of Natural Gas makes it suitable for residential heating?What Are As Built Drawings and Why Are They Important?Final drawings on a job are commonly referred to as what?What Does a 0 Volt Reading Mean for Your Thermostat?In a heating system, what voltage reading indicates that a thermostat is potentially malfunctioning?What does a gurgling sound from your water heater mean?What might a gurgling sound from a firing water heater indicate?What Happens When the By-Pass Valve is Closed in a Gas Heater?If the By-Pass Valve is closed in a Gas Heater, what is the most probable effect?What Happens When the Fan Compartment Door Is Left Off?What happens if the fan compartment door of an appliance is left off the motor?What Makes Methane the Star of Natural Gas?What is considered the primary component of Natural Gas?What Markings Should Propane Cylinders Have?What markings are required on a propane cylinder?What to Do When Your Home Has Excess Moisture After Heating InstallationWhat should be recommended if a customer complains that their walls and windows are wet after installing a Direct Vent Radiant Heating System?What to Know About Installing Room Heaters in Your BathroomWhat type of room heater can be installed in a bathroom?What You Need to Know About Dryer Clearance to Combustible MaterialsWhat is the minimum clearance from the sides of a Domestic Dryer to combustible materials?What You Need to Know About High Combustion Energy and Flame TemperatureWhat is the characteristic feature of a substance with a flame temperature of 3600 degrees Fahrenheit?What You Need to Know About Installing a Fireplace InsertWhich of the following is acceptable when installing a Fireplace insert?What You Need to Know About Radiant Heat for Your G2 ExamRadiant heat is characterized as:What You Need to Know Before Cleaning Electronic CellsWhat must be ensured before electronic cells are removed for cleaning?What’s the Ideal Indoor Humidity for Your Home?What is the recommended range of Relative Humidity in a house for optimal indoor conditions?What’s the Maximum Gas Pressure for a Mechanical Room on a Rooftop?What is the maximum gas pressure that can be supplied to a mechanical room on the roof of a commercial building?Where to Install the Circulation Pump in a Hydronic System?Where is the Circulation Pump typically installed in a hydronic system?Where You Find Safety Controls on Electrical Schematic Diagrams?On an electrical schematic diagram, safety controls are typically drawn where?Why Insulating Ducts is Key to Preventing CondensationTo prevent condensation from forming on the outside of a duct, the duct must be:Why Isolating Millivolt Wiring from Line Voltage MattersWhy should Millivolt wiring be isolated from Line Voltage Wiring?Why It’s Essential to De-Energize a Circuit Before Using an OhmmeterWhy is it necessary to de-energize a circuit before using an Ohmmeter?Why Properly Insulating Ductwork Matters for Energy EfficiencyWhat is a common consequence of not properly insulating ductwork?Why Setting the Relief Valve at 15 PSIG is Crucial for Low Pressure Steam SystemsThe relief valve for a low pressure steam system should be set at:Why Understanding Flame Speed Is Crucial for Gas TechniciansWhy is understanding flame speed important for gas technicians?Why Understanding Ground Fault Circuit Interrupters Is Essential for Electrical SafetyWhat is the primary function of a Ground Fault Circuit Interrupter?Why Understanding Voltage in Gas Systems is EssentialWhich component is essential for measuring voltage in gas systems?Why Venting is Crucial When Connecting an Air Handler and Water HeaterWhen connecting an air handler and a water heater for combination heating use, which factor is most critical to consider?
More practice questions

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  • What happens to the pressure difference across a water pump as flow rate increases?
  • What is the boiling point of natural gas?
  • What is the most effective way to prevent Lime-Scale deposits in Water Heater Tanks?
  • In an Air Handler, which component controls the flow rate of water through the heating coil?
  • What is an important consideration when installing draft regulators on gas appliances?
  • What does the Unitrol in a residential water heater tank do?
  • What is the minimum distance that the vent from a 75,000 BTUH category 3 furnace may terminate from a door?
  • Which type of wire is acceptable and most cost-effective for concealed supply wiring of a new appliance in a residential basement?
  • If the Vent Motor fails, which component will shut off the Gas Valve and stop the Gas Flow?
  • If replacing an old Natural Gas Fired Furnace that was firing at 140 MBTUH, what size furnace should be installed if the heat loss calculations allow for 45 BTUH per square foot for a 1200 square foot house?
  • What is equivalent to 28 inches of Water Column (W.C.)?
  • When a Baffle is used to prevent rain from entering an air supply opening, how much can it reduce the required free area opening?
  • Why is a relief valve used in a gas regulator?
  • Which component is identified as open when the thermostat terminals read 0 volts and the gas valve coil terminals read 24 volts?
  • What is a Monitor Regulator used for?
  • What is the Net Stack Temperature measured as?
  • What is the main purpose of using a redundant regulator?
  • What happens if the water heater does not have a functioning High Limit Aquastat?
  • What is the best procedure to increase the speed of a furnace blower?
  • What is the typical setting range for the High Limit Aquastat in water heaters?
  • What is the clearance to combustible appliance required for a Free Standing Room Heater?
  • Why is it important to maintain proper distance from combustible materials around gas appliances?
  • What is a common cause for a failure in a pressure switch?
  • For a 60,000 BTUH water heater installed in a closet without a draft diverter, what is required for air intake?
  • As the temperature of a Thermistor rises, the resistance does what?
  • How are manual shut-off valves typically connected to piping?
  • What happens to the heating output from the air handler as the outlet temperature decreases in a combination heating system?
  • A receptacle mounted Ground Fault Circuit Interrupter protects against which of the following?
  • What is a critical safety consideration when working with Millivolt systems?
  • What should be checked if a customer reports that the pilot light goes out intermittently?
  • A British Thermal Unit (BTU) is defined as the amount of heat required to:
  • What is the minimum supply air in CFM per ton of cooling required for a domestic air conditioner?
  • What is the maximum length of a Corrugated Flexible Connector when installed on a range?
  • If one cubic foot of Natural Gas is 1000 BTUH, what is the ratio of Excess Air?
  • What type of voltage does a Thermopile or Powerpile generate?
  • What is the flame speed for Natural Gas?
  • What materials are approved for joining single wall vent connectors?
  • In a heated space, which factor can significantly increase comfort and reduce indoor contaminants?
  • How often should oxygen regulators be oiled?
  • What action must be taken if cracks are found in the Heat Exchanger of a Furnace?
  • The External Bypass Valve in a Gas Pool Heater is set by determining what?
  • Residential hot water boilers typically operate at which temperature and pressure?
  • What is the effect of resisting boiling pressure in low-pressure steam boilers?
  • In a conventional furnace, the high limit switch is wired in series with which component?
  • Which of the following is a corrective action to take for high indoor humidity levels?
  • Which term refers to the measurement of gas flow in BTU?
  • In what context is it required to consider the free air space of a grill?
  • What is the operating temperature setting for the High Limit Aquastat in residential water heaters?
  • What is the recommended method for adjusting and setting the pressure on an appliance regulator?
  • For a system requiring efficiency, if the combustion air ratio for propane is considered high, what is likely the ratio of combustion air used?
  • What is the required minimum depth for plastic piping or tubing installed under a commercial parking lot?
  • Which gas has a specific gravity of 1.52?
  • What is the maximum outlet pressure for a second stage regulator on a residential propane tank system?
  • In a heating system, what can be considered a safe amount of excess air for combustion efficiency when using natural gas?
  • How must the vent from a Gas Fired Appliance be installed if it vents into a chimney flue serving a solid fuel appliance?
  • Steel Boilers are generally classified as what type?
  • In what way can a hydrated atmosphere affect the thermal comfort level in a home?
  • What is the primary purpose of an Electrical Pictorial Diagram?
  • What is the minimum height above a flat roof for a vent that is 8 feet away from a building that is 4 feet taller?
  • A Leak Limiting Device on a regulator:
  • What is a common application for Propane Gas in residential settings?
  • What is the maximum pressure allowed in a cylinder of propane?
  • What type of Flux should be used when Brazing Copper Tubing for a Propane System?
  • Can a Shut-off Valve be installed Upstream of a Relief Valve to allow for the removal of the Relief Valve for servicing without having to empty the contents of a tank?
  • What is the Specific Gravity of Liquid Propane when compared to water?
  • Which of the following best describes Ohm's Law?
  • What size of wire is typically used as a Tracer Wire?
  • To achieve proper combustion in appliances, mixing primary air before ignition primarily results in what type of flame?
  • A zero Ohmmeter reading between the casing of a Solenoid and a disconnected wire indicates what condition?
  • What is convection?
  • What is the primary purpose of the Building Skin?
  • What factors are used to size circulating pumps in a heating system?
  • Which of the following is a common reason for the failure of a gas system to heat?
  • Under what condition is it permissible to use gas piping as an Electrical Ground?
  • Why is a Pressure Relief Valve necessary in a hot water system?
  • What is the correct method for leak testing a replaced gas water heater?
  • What is the impact of increased current in an appliance?
  • What size opening is needed for a grill rated at 75% free area if a Free Air Opening of 152 Square Inches is required?
  • What is the function of a Ground Fault Circuit GFC?
  • In what scenario would a non-corrosive flux be recommended?
  • How far should the discharge piping from the temperature and pressure relief valve on a water heater terminate from the floor?
  • Is it permissible to use a switch in the Neutral line?
  • In the context of furnace operation, what does a high limit switch do?
  • What does a hard sharp small flame indicate?
  • If one cubic foot of Propane Gas is 2500 BTUH, what is the ratio of Combustion Air?
  • What device is used to prove that a Dryer Motor is running?
  • What is a potential hazard of having inadequate ventilation in a tight building?
  • In an electrical schematic, how are operating controls generally represented?
  • What type of vent must be used if the vent of a Wall Furnace is concealed in a partition wall?
  • What are the primary components of a gas-fired refrigerator?
  • Upon determining that the Voltage is approximately 120 volts, which scale should be selected on an analog meter for the best accuracy?
  • What component prevents operation when the vent motor on a power vent water heater fails?
  • A Thermostat with a Single Mercury Bulb, which controls Single Stage Heat and Single Stage Cool, is categorized as what type of control?
  • What is the most accurate way to determine the amount of propane in a large storage tank?
  • What must be done to piping or tubing that passes through concrete?
  • What is the larger cylinder size commonly used for propane?
  • If a Water Heater with a Draft Diverter is connected to a Masonry Chimney, what is the required vent size given specific parameters?
  • What is the recommended location for a cooling coil on a suspended or horizontal furnace?
  • What is a potential hazard if a gas valve fails to receive proper voltage?
  • If the resistance of a wire increases, what happens to the temperature of the wire?
  • Given the equipment firing rates, what should be the grill size required for 3 Hot Water Boilers, 2 Hot Water Heaters, and 1 Domestic Hot Water Heater?
  • Which component must be provided in confined areas with high BTUH input?
  • What type of flame results from mixing primary air with gas prior to ignition?
  • What is the maximum distance that piping supports should be spaced on a 4-inch gas line?
  • In a combination heating system utilizing a water heater, where should isolation valves be installed?
  • Which device protects loads served for that breaker?
  • What is the required combustion air opening size for appliances in a structure with an equivalent leakage area greater than 0.05 square meters, given specific input BTUs?
  • The Gas Meter Test Dial can be used for:
  • In terms of gas appliance safety, why is specific gravity important?
  • What is the most crucial element needed for proper combustion in a gas appliance?
  • What is the term used to describe the closing force in a gas regulator?
  • What additional component must be installed in a combination system to stabilize water pressure?
  • If a belt on a blower is too tight, what will happen to the blower motor current?
  • Which two products are undesirable results of incomplete combustion?
  • In a different no heat call scenario, if the high limit terminals read 110 volts while the thermostat terminals read 0 volts, which component is identified as open?
  • Which component performs the loading function in a gas regulator?
  • What should the pressure relief valve for low-pressure hot water systems be set at?
  • What should be done as the length of an electrical run increases?
  • What is the maximum pressure allowed for propane supply in industrial buildings?
  • What substance is commonly added to natural gas to give it an odor?
  • Which type of appliance is suitable for installation in a confined space such as a bathroom?
  • What is a likely symptom indicating the need to check for a down draft issue in a furnace?
  • What is the purpose of an anti-scald device in a hot water system?
  • When using an Ohmmeter, what is the most important thing to remember before taking a measurement?
  • What does "temperature rise" refer to in the context of a hot water heater?
  • What is the minimum Time and Pressure required to test a new welded 4" NPS piping system that is 100 Feet long?
  • Zero governors are designed to deliver an outlet pressure equal to what?
  • When increasing flow rate, what trend is observed in the pressure difference across the pump?
  • What is the role of temperature and pressure relief valves in water heaters?
  • A 120 Volt Power Supply for a residential Electrical Circuit is taken from which of the following?
  • Through what process does air enter a house?
  • What role does a balancing valve play in a heating system?
  • What size and larger piping must be welded unless otherwise authorized?
  • What should be done before adjusting the set point of a gas appliance regulator?
  • What is the material requirement for piping that passes through fire-rated walls?
  • Which condition is a result of insufficient air flow in an air cleaner system?
  • Before firing a gas burner in a steam boiler system, what is the first thing that must be checked?
  • What is the primary function of a Thermal Expansion Tank?
  • Head pressure in a piping system for hot water heating is defined as what?
  • Which of the following tools is best for measuring resistance in a circuit?
  • At what temperature is the ECO set to operate in residential water heaters?
  • What is the metric unit for heat energy equivalent to one British Thermal Unit?
  • What is the main purpose of a Low Limit in a Combination System?
  • Which of the following is NOT a type of valve used in gas systems?
  • Which of the following could be a consequence of setting the ECO too high in a residential water heater?
  • What is the maximum input of the vent for a Water Heater rated at 50,000 BTUH located 3 feet from the chimney, with a rise of 2 feet and a chimney height of 25 feet?
  • In applications with frequent throttling of water flow, which valve is most appropriate to use?
  • What is condensate in a Boiler Heating System?
  • When should a Relief Valve on a Regulator operate?
  • What type of wire should be used in damp locations?
  • What is the primary purpose of a Ground Fault Circuit Interrupter (GFCI)?
  • What is the equivalent of a 2-inch NPS Schedule 40, 90 degree threaded elbow?
  • How far should a dryer moisture exhaust duct terminate from a service regulator?
  • When calculating the size of ventilation openings, which variable is crucial to consider besides appliance BTUH ratings?
  • What type of control does a Thermostat serve for a unit with separate Heating and Cooling transformers with one stage of each?
  • If there is a gurgling sound from the Hot Water Tank, what is the most probable cause?
  • What effect does a dirty prefilter have on the cooling system?
  • If too many Lava Rocks are placed in the rack of a barbeque, what is likely to happen?
  • In a conventional residential furnace, the high temperature limit switch is wired in series with which component?
  • What is the maximum supply pressure allowed in a Single Family Dwelling downstream of the utility termination?
  • What is the result of poor insulation in a house?
  • What happens if water is added to acid instead of the other way around during dilution?
  • What is the minimum service clearance required in front of a boiler?
  • What is the most common cause of flue gas spillage from gas appliances?
  • A pressure reading of 14.7 psi is equivalent to what?
  • How often should safety relief valves be tested for proper operation?
  • What does the Gross Stack Temperature measure?
  • Which method of joined steel piping is NOT acceptable for natural gas systems?
  • What is the rating system for switches based on?
  • What is the purpose of installing a Balancing Valve in a Combo Heating System?
  • What happens if you install a switch in the neutral line?
  • Why is it important to set the ECO at 200 degrees Fahrenheit?
  • Which characteristic is NOT typically used to classify a gas regulator?
  • What issue arises from using a fire pot that is too large in a converted furnace or boiler?
  • What ratio of combustion air is typically recommended for effective combustion in propane systems?
  • In a schematic diagram, where are the safety controls typically located?
  • As the length of a conductor increases, what happens to the voltage drop along the conductor?
  • What is the regulation regarding Single Wall Vent Connectors passing through floors, ceilings, or roofs?
  • What is the purpose of the High Limit Aquastat in a residential water heater?
  • What happens to indoor air quality when mechanical ventilation systems are overly used?
  • When should a gas burner be fired in a steam boiler system?
  • Which factor does NOT typically affect the required water flow rate in a heating system?
  • When sizing a Common Vent for more than one Natural Gas Appliance, what is one factor to consider?
  • A Pressure Regulator is a device that:
  • What is the primary function of a zero governor?
  • What is the required rough opening when the Air Supply opening is 50 Square Inches and the grill has a free area of 75%?
  • As the temperature of a Thermistor increases, what happens to the current flow through it?
  • What is the minimum clearance to combustibles from the top of the plenum of a Converted Forced Warm Air Furnace?
  • What should the open circuit test reading of a thermocouple be within?
  • For a Single Natural Draft Appliance with 1,000,000 BTUH input, what is the minimum diameter of the Single Wall Vent Connector?
  • After which year must gas tanks be regulated by Transport Canada?
  • When is it permissible to use Bushings to reduce piping size?
  • A low water cut off device on an automatically fired hot water heating boiler rated at 350,000 BTUH is required when:
  • What is the maximum clearance from the sides of a Domestic Range to combustible materials?
  • What should be installed if the supply pressure exceeds the working pressure of the water heater tank?
  • For an appliance without a draft hood with an input of 50,000 BTUH, what is the minimum combustion air opening required in a tightly constructed building?
  • What rating is typical for a fuse protecting a circuit with #14 AWG wire?
  • For a newly installed 4" NPS piping system, what is the alternative test method compared to standard pressure testing?
  • What will happen if the 24 Volt transformer for a Power Humidifier is wired in series with the humidistat and the humidifier motor?
  • What type of venting is allowed for a gas appliance installed in conjunction with a chimney used by solid fuel?
  • What is the primary function of a ventor motor in a power vent water heater?
  • How many BTUH are being generated by a Natural Gas meter that has a One Cubic Foot Test Dial making one revolution every 22 seconds?
  • What is tested by disconnecting the Air Circulating Blower on a Force Warm Air Furnace?
  • What is the range of voltage typically found in the power section of an Electronic Air Cleaner (EAC)?
  • What does temperature rise mean in the context of hot water heating?
  • How can the accuracy of a Flue Gas Analyzer measuring CO2 be verified?
  • What is the maximum permitted filling density of a cylinder with Liquid Propane?
  • Which component in a residential water heater is responsible for limiting the maximum temperature?
  • Which substances are used in an absorption refrigeration cycle?
  • What is the minimum termination height for a propane gas unit in an RV or motorhome?
  • If an appliance rated over 400,000 BTUH is installed in a Boiler Room with a combustion air opening of 90 Square Inches, what size of ventilation air opening is required?
  • A One-Half Cubic Foot Test Dial on a meter makes One Revolution every 22 seconds. Approximately how much Heat is being generated?
  • Which of the following components is essential for the safe operation of a gas regulator?
  • What type of maintenance can help ensure the High Limit Aquastat functions properly?
  • What is the flame temperature for Propane Gas?
  • Water Jackets allow water to circulate from section to section in what type of boiler?
  • Which component, when checked, can indicate if a gas valve coil is functioning properly?
  • What issue is referred to when an impeller has air in it?
  • When do plate humidifiers operate?
  • What is the main purpose of adding Mercaptan to natural gas?
  • What is the effect of using the wrong type of fuel in a gas appliance?
  • What type of control valve allows for an infinite range of firing rates between low fire and high fire?
  • Which component is primarily responsible for maintaining stable water pressure during temperature changes?
  • In a water heater, what does ECO stand for?
  • Which instrument is used to measure the speed of a Direct Drive Fan Motor?
  • When two 10 ohm resistors are connected in Series, what is the net result?
  • What might occur if the High Limit Aquastat fails?
  • As the number of occupants in a tightly constructed building increases, what happens to the relative humidity?
  • Which of the following appliances would typically utilize a Single Acting type Draft Regulator?
  • How many inches of W.C. is 0.5 PSIG?
  • What is the required test duration for a new welded piping system with a supply pressure of 5 PSIG?
  • If a relief valve is leaking, what should be the immediate course of action?
  • Which brazing rods should not be used for natural gas/propane due to their reaction with sulfur?
  • What should be done with joints in a gas piping system to ensure safety?
  • When connecting two 10 microfarad capacitors in parallel, what is the net result?
  • An appliance vent must terminate at least how far away from any building mechanical air inlet?
  • What is the net result when two 10 microfarad capacitors are connected in series?
  • Which component is illustrated in an Electrical Pictorial Diagram?
  • Where is an inline Ammeter connected in relation to the device being checked?
  • What is the maximum temperature typically tolerated in residential hot water distribution?
  • What is a Fan Control classified as?
  • When two 10 ohm resistors are connected in Parallel, what is the net result?
  • Which of the following statements is true regarding radiant heat?
  • What is the normal return air requirement for a forced air furnace?
  • What is the flame speed for Propane Gas?
  • What would be the approximate combustion air requirement for a system using natural gas as fuel?
  • What might be a consequence of a poorly insulated house?
  • When should every branch supply line of a piping system be purged?
  • What is the normal Supply Air volume for a Forced Air Furnace in CFM?
  • What happens if a gas appliance does not receive sufficient air?
  • What is the main cause for the stack effect in a residential water heater?
  • Aquastats respond to changes in:
  • If one cubic foot of Natural Gas is 1000 BTUH, what is the ratio of Total Air?
  • What must an installer do when converting an appliance from another form of energy to gas?
  • Why is it essential to know the ignition temperature of a gas?
  • What is the function of a pressure gauge in a gas system?
  • Is it permissible to use the propane side of a refrigerator in a recreational vehicle while it is in motion?
  • In a propane gas system exceeding 5 PSIG, what should the line relief valve be set to?
  • What are the explosion limits for Natural Gas?
  • What is a common consequence of improper installation of a gas appliance?
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