Gas fitter 2 practice test questions with
complete solutions
A room heater installed in either a sleeping area or public area shall be:
c c c c c c c c c c c c c
A. direct vent only
c c c
B. equipped with a regulator
c c c c
C. equipped with a fan
c c c c
D. equipped with an on / off switch on the wall - answer-B
c c c c c c c c c c c c
What type of vent must be used when the vent of a wall furnace will be concealed in a
c c c c c c c c c c c c c c c c c c
partition wall?
c c
A. B vent
c c
B. L vent
c c
C. BH vent
c c
D. BW vent - answer-D
c c c c
Single wall vent connectors:
c c c
A. may pass through floors, ceilings or roofs provided a metal thimble is used
c c c c c c c c c c c c c
B. may pass through floors, ceilings or roofs provided the required minimum distance
c c c c c c c c c c c c
from combustible material is maintained
c c c c c
C. may pass through floors, ceilings or roofs provided they are insulated
c c c c c c c c c c c
D. shall not pass through floors, ceilings or roofs - answer-D
c c c c c c c c c c
BW vent shall be used only with an approved:
c c c c c c c c
A. decorative appliance
c c
B. down flow furnace
c c c
C. revertible flue boiler
c c c
D. recessed wall furnace - answer-D
c c c c c
What must be done during the installation of a gas log fireplace?
c c c c c c c c c c c
A. Make sure there is a metal mesh screen in front of the fireplace
c c c c c c c c c c c c c
B. Secure the chimney damper in the open position
c c c c c c c c
C. Install a pressure regulator
c c c c
D. Install a metal chimney liner - answer-B
c c c c c c c
When can a certified hose be used to connect a construction heater to temporary
c c c c c c c c c c c c c
piping?
c
A. Only if a lever handle shut off valve is installed upstream of the hose
c c c c c c c c c c c c c c
B. Only if the hose is 15 feet long
c c c c c c c c
C. Never - answer-A
c c c
,Which of the following is acceptable when a fireplace insert is installed?
c c c c c c c c c c c
A. A metal chimney linear
c c c c
B. The existing fireplace flue
c c c c
C. BW vent
c c
D. A tile lined fireplace flue? - answer-A
c c c c c c c
An unvented infra-red heater can be installed in ________ application
c c c c c c c c c c
A. A warehouse
c c
B. A commercial building
c c c c
C. An industrial building
c c c
D. All of the above - answer-D
c c c c c c
Dirt pockets are required on:
c c c c
A. Decorative appliances
c c
B. Gas logs
c c
C. Room heaters
c c
D. None of the available choices - answer-D
c c c c c c c
What diameter and length of a dirt pocket is required when a drop line is 3-inch
c c c c c c c c c c c c c c c
diameter?
c
A. 3 inch diameter by 3 inches long
c c c c c c c
B. 1 inch diameter by 3 inches long
c c c c c c c
C. 3/4 inch diameter by 3 inches long
c c c c c c c
D. 2 inch diameter by 3 inches long - answer-D
c c c c c c c c c
What type of room heater maybe installed in a bathroom?
c c c c c c c c c
A. Natural draft
c c
B. Direct fired
c c
C. Forced draft
c c
D. Direct vent - answer-D
c c c c
What safety control protects a steam boiler if the condensate pump fails to return water
c c c c c c c c c c c c c c
to the boiler?
c c c
A. High pressure limit control
c c c c
B. Low pressure limit control
c c c c
C. Flame safeguard control
c c c
D. Low water cut off - answer-D
c c c c c c
The relief valve for a residential low-pressure hot water boiler system should be?
c c c c c c c c c c c c
A. 14.7 psia
c c
B. 15 psia
c c c
C. 30 psig
c c
D. 30 psia - answer-C
c c c c
A backflow prevent used in a boiler system should be located in the:
c c c c c c c c c c c c
A. Over flow line connected to the drain
c c c c c c c
,B. Return line close to the boiler
c c c c c c
C. 1/4" line connecting the boiler and cushion tank
c c c c c c c c
D. Make up water line to the system - answer-B
c c c c c c c c c
Automatic chlorinators must be installed: c c c c
A. upstream of the heater
c c c c
B. downstream of the heater
c c c c
C. upstream of the filter
c c c c
D. downstream of the filter - answer-B
c c c c c c
On seasonal start up, a pool heater should run:
c c c c c c c c
A. intermittently
c
B. continuously for 24 hours
c c c c
C. continuously until the thermostat is satisfied
c c c c c c
D. one hour on and one hour off until the thermostat is satisfied - answer-C
c c c c c c c c c c c c c c
Before lighting a burner in a steam boiler, ensure that:
c c c c c c c c c
A. there is water in the boiler
c c c c c c
B. the temperature controller is set properly
c c c c c c
C. the main burner test firing valve is turned on
c c c c c c c c c
D. the safety valves are open - answer-A
c c c c c c c
The recommended water temperature setting from a mixing valve to the domestic water
c c c c c c c c c c c c
system in combination heating systems that employ oil-fired water heaters for heating
c c c c c c c c c c c c
potable water and for space heating is:
c c c c c c c
A. 43°C (110°F)
c c
B. 49°C to 54°C (120°F to 130°F)
c c c c c c
C. 60°C to 66°C (140°F to 150°F)
c c c c c c
D. 83°C (180°F) - answer-B
c c c c
An inverted sensor (measures water level) can be found operating what type of
c c c c c c c c c c c c
appliance?
c
A. Hot water boiler
c c c
B. Steam water boiler
c c c
C. Domestic hot water storage tank
c c c c c
D. Domestic potable hot water tank - answer-D
c c c c c c c
A backflow prevent used in a hydronic heating system is used to:
c c c c c c c c c c c
A. Keep hot water from entering the cold water system
c c c c c c c c c
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of
c c c c c c c c c c c c c c c
air
c
C. Prevent the heating water from circulating the wrong way in the system
c c c c c c c c c c c c
D. Keep non-combustible water from entering the drinking water system - answer-D
c c c c c c c c c c c
A low water cut off device on an automatically fired hot water heating boiler rated at
c c c c c c c c c c c c c c c
350,000 Btuh (102 kW) is:
c c c c c
, A. Not required if a limit control is installed
c c c c c c c c
B. Not required if it is installed in the industrial application
c c c c c c c c c c c
C. Required when any portion of the circulating system is located below the boiler
c c c c c c c c c c c c c
D. Required only in commercial applications - answer-C
c c c c c c c
A pressure reducing valve
c c c c
A. Relieves system pressure in excess of the set pressure
c c c c c c c c c
B. Reduces the city main pressure to a safe working pressure
c c c c c c c c c c
C. Reduces the working pressure to the city main pressure
c c c c c c c c c
D. Prevents hot water gravity circulation - answer-B
c c c c c c c
The maximum operating pressure of a low pressure steam boiler is
c c c c c c c c c c
A. 5 psig (35kPa)
c c c
B. 15 psig (100 kPa)
c c c c
C. 100 psig (690 kPa)
c c c c
D. 150 psig (1035 kPa) - answer-B
c c c c c c
A scotch marine boiler is what type of boiler?
c c c c c c c c
A. Two pass boiler
c c c
B. Copper tube boiler
c c c
C. Fire tube boiler
c c c
D. Four pass water tube boiler - answer-C
c c c c c c c
A fire tube boiler has:
c c c c
A. Water outside the tube and flue gases outside
c c c c c c c c
B. Water inside the tubes and flue gasses outside
c c c c c c c c
C. Water inside the tubes and water outside
c c c c c c c
D. Water outside the tubes and flue gases inside - answer-D
c c c c c c c c c c
Why is a pressure relief valve installed on a pool heater system?
c c c c c c c c c c c
A. To maintain the pool water level
c c c c c c
B. To prevent over pressurizing the filter
c c c c c c
C. To prevent damage to the system
c c c c c c
D. To relieve excess water pressure caused by solar gun - answer-C
c c c c c c c c c c c
When does an electrically operated automatic vent damper on a mid-efficiency furnace
c c c c c c c c c c c
open?
c
A. Before the ignition cycle
c c c c c
B. When the furnace is hot
c c c c c c
C. At the same time as the gas comes on
c c c c c c c c c
D. When the main switch is turned on - answer-A
c c c c c c c c c
What is the minimum distance the vent of a Category 4 furnace with an input under
c c c c c c c c c c c c c c c
100,000 Btuh can terminate from a combustion air inlet of any other appliance?
c c c c c c c c c c c c c
A. 12" c
B. 36" c
complete solutions
A room heater installed in either a sleeping area or public area shall be:
c c c c c c c c c c c c c
A. direct vent only
c c c
B. equipped with a regulator
c c c c
C. equipped with a fan
c c c c
D. equipped with an on / off switch on the wall - answer-B
c c c c c c c c c c c c
What type of vent must be used when the vent of a wall furnace will be concealed in a
c c c c c c c c c c c c c c c c c c
partition wall?
c c
A. B vent
c c
B. L vent
c c
C. BH vent
c c
D. BW vent - answer-D
c c c c
Single wall vent connectors:
c c c
A. may pass through floors, ceilings or roofs provided a metal thimble is used
c c c c c c c c c c c c c
B. may pass through floors, ceilings or roofs provided the required minimum distance
c c c c c c c c c c c c
from combustible material is maintained
c c c c c
C. may pass through floors, ceilings or roofs provided they are insulated
c c c c c c c c c c c
D. shall not pass through floors, ceilings or roofs - answer-D
c c c c c c c c c c
BW vent shall be used only with an approved:
c c c c c c c c
A. decorative appliance
c c
B. down flow furnace
c c c
C. revertible flue boiler
c c c
D. recessed wall furnace - answer-D
c c c c c
What must be done during the installation of a gas log fireplace?
c c c c c c c c c c c
A. Make sure there is a metal mesh screen in front of the fireplace
c c c c c c c c c c c c c
B. Secure the chimney damper in the open position
c c c c c c c c
C. Install a pressure regulator
c c c c
D. Install a metal chimney liner - answer-B
c c c c c c c
When can a certified hose be used to connect a construction heater to temporary
c c c c c c c c c c c c c
piping?
c
A. Only if a lever handle shut off valve is installed upstream of the hose
c c c c c c c c c c c c c c
B. Only if the hose is 15 feet long
c c c c c c c c
C. Never - answer-A
c c c
,Which of the following is acceptable when a fireplace insert is installed?
c c c c c c c c c c c
A. A metal chimney linear
c c c c
B. The existing fireplace flue
c c c c
C. BW vent
c c
D. A tile lined fireplace flue? - answer-A
c c c c c c c
An unvented infra-red heater can be installed in ________ application
c c c c c c c c c c
A. A warehouse
c c
B. A commercial building
c c c c
C. An industrial building
c c c
D. All of the above - answer-D
c c c c c c
Dirt pockets are required on:
c c c c
A. Decorative appliances
c c
B. Gas logs
c c
C. Room heaters
c c
D. None of the available choices - answer-D
c c c c c c c
What diameter and length of a dirt pocket is required when a drop line is 3-inch
c c c c c c c c c c c c c c c
diameter?
c
A. 3 inch diameter by 3 inches long
c c c c c c c
B. 1 inch diameter by 3 inches long
c c c c c c c
C. 3/4 inch diameter by 3 inches long
c c c c c c c
D. 2 inch diameter by 3 inches long - answer-D
c c c c c c c c c
What type of room heater maybe installed in a bathroom?
c c c c c c c c c
A. Natural draft
c c
B. Direct fired
c c
C. Forced draft
c c
D. Direct vent - answer-D
c c c c
What safety control protects a steam boiler if the condensate pump fails to return water
c c c c c c c c c c c c c c
to the boiler?
c c c
A. High pressure limit control
c c c c
B. Low pressure limit control
c c c c
C. Flame safeguard control
c c c
D. Low water cut off - answer-D
c c c c c c
The relief valve for a residential low-pressure hot water boiler system should be?
c c c c c c c c c c c c
A. 14.7 psia
c c
B. 15 psia
c c c
C. 30 psig
c c
D. 30 psia - answer-C
c c c c
A backflow prevent used in a boiler system should be located in the:
c c c c c c c c c c c c
A. Over flow line connected to the drain
c c c c c c c
,B. Return line close to the boiler
c c c c c c
C. 1/4" line connecting the boiler and cushion tank
c c c c c c c c
D. Make up water line to the system - answer-B
c c c c c c c c c
Automatic chlorinators must be installed: c c c c
A. upstream of the heater
c c c c
B. downstream of the heater
c c c c
C. upstream of the filter
c c c c
D. downstream of the filter - answer-B
c c c c c c
On seasonal start up, a pool heater should run:
c c c c c c c c
A. intermittently
c
B. continuously for 24 hours
c c c c
C. continuously until the thermostat is satisfied
c c c c c c
D. one hour on and one hour off until the thermostat is satisfied - answer-C
c c c c c c c c c c c c c c
Before lighting a burner in a steam boiler, ensure that:
c c c c c c c c c
A. there is water in the boiler
c c c c c c
B. the temperature controller is set properly
c c c c c c
C. the main burner test firing valve is turned on
c c c c c c c c c
D. the safety valves are open - answer-A
c c c c c c c
The recommended water temperature setting from a mixing valve to the domestic water
c c c c c c c c c c c c
system in combination heating systems that employ oil-fired water heaters for heating
c c c c c c c c c c c c
potable water and for space heating is:
c c c c c c c
A. 43°C (110°F)
c c
B. 49°C to 54°C (120°F to 130°F)
c c c c c c
C. 60°C to 66°C (140°F to 150°F)
c c c c c c
D. 83°C (180°F) - answer-B
c c c c
An inverted sensor (measures water level) can be found operating what type of
c c c c c c c c c c c c
appliance?
c
A. Hot water boiler
c c c
B. Steam water boiler
c c c
C. Domestic hot water storage tank
c c c c c
D. Domestic potable hot water tank - answer-D
c c c c c c c
A backflow prevent used in a hydronic heating system is used to:
c c c c c c c c c c c
A. Keep hot water from entering the cold water system
c c c c c c c c c
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of
c c c c c c c c c c c c c c c
air
c
C. Prevent the heating water from circulating the wrong way in the system
c c c c c c c c c c c c
D. Keep non-combustible water from entering the drinking water system - answer-D
c c c c c c c c c c c
A low water cut off device on an automatically fired hot water heating boiler rated at
c c c c c c c c c c c c c c c
350,000 Btuh (102 kW) is:
c c c c c
, A. Not required if a limit control is installed
c c c c c c c c
B. Not required if it is installed in the industrial application
c c c c c c c c c c c
C. Required when any portion of the circulating system is located below the boiler
c c c c c c c c c c c c c
D. Required only in commercial applications - answer-C
c c c c c c c
A pressure reducing valve
c c c c
A. Relieves system pressure in excess of the set pressure
c c c c c c c c c
B. Reduces the city main pressure to a safe working pressure
c c c c c c c c c c
C. Reduces the working pressure to the city main pressure
c c c c c c c c c
D. Prevents hot water gravity circulation - answer-B
c c c c c c c
The maximum operating pressure of a low pressure steam boiler is
c c c c c c c c c c
A. 5 psig (35kPa)
c c c
B. 15 psig (100 kPa)
c c c c
C. 100 psig (690 kPa)
c c c c
D. 150 psig (1035 kPa) - answer-B
c c c c c c
A scotch marine boiler is what type of boiler?
c c c c c c c c
A. Two pass boiler
c c c
B. Copper tube boiler
c c c
C. Fire tube boiler
c c c
D. Four pass water tube boiler - answer-C
c c c c c c c
A fire tube boiler has:
c c c c
A. Water outside the tube and flue gases outside
c c c c c c c c
B. Water inside the tubes and flue gasses outside
c c c c c c c c
C. Water inside the tubes and water outside
c c c c c c c
D. Water outside the tubes and flue gases inside - answer-D
c c c c c c c c c c
Why is a pressure relief valve installed on a pool heater system?
c c c c c c c c c c c
A. To maintain the pool water level
c c c c c c
B. To prevent over pressurizing the filter
c c c c c c
C. To prevent damage to the system
c c c c c c
D. To relieve excess water pressure caused by solar gun - answer-C
c c c c c c c c c c c
When does an electrically operated automatic vent damper on a mid-efficiency furnace
c c c c c c c c c c c
open?
c
A. Before the ignition cycle
c c c c c
B. When the furnace is hot
c c c c c c
C. At the same time as the gas comes on
c c c c c c c c c
D. When the main switch is turned on - answer-A
c c c c c c c c c
What is the minimum distance the vent of a Category 4 furnace with an input under
c c c c c c c c c c c c c c c
100,000 Btuh can terminate from a combustion air inlet of any other appliance?
c c c c c c c c c c c c c
A. 12" c
B. 36" c
