Gas fitter 2 practice test with Complete
Solutions
What type of room heater maybe installed in a bathroom?
A. Natural draft
B. Direct fired
C. Forced draft
D. Direct vent Correct Ans-D
What safety control protects a steam boiler if the condensate pump fails to return water to the
boiler?
A. High pressure limit control
B. Low pressure limit control
C. Flame safeguard control
D. Low water cut off Correct Ans-D
The relief valve for a residential low-pressure hot water boiler system should be?
A. 14.7 psia
B. 15 psia
C. 30 psig
D. 30 psia Correct Ans-C
A backflow prevent used in a boiler system should be located in the:
A. Over flow line connected to the drain
B. Return line close to the boiler
C. 1/4" line connecting the boiler and cushion tank
,D. Make up water line to the system Correct Ans-B
Automatic chlorinators must be installed:
A. upstream of the heater
B. downstream of the heater
C. upstream of the filter
D. downstream of the filter Correct Ans-B
On seasonal start up, a pool heater should run:
A. intermittently
B. continuously for 24 hours
C. continuously until the thermostat is satisfied
D. one hour on and one hour off until the thermostat is satisfied Correct Ans-C
Before lighting a burner in a steam boiler, ensure that:
A. there is water in the boiler
B. the temperature controller is set properly
C. the main burner test firing valve is turned on
D. the safety valves are open Correct Ans-A
The recommended water temperature setting from a mixing valve to the domestic water system
in combination heating systems that employ oil-fired water heaters for heating potable water
and for space heating is:
A. 43°C (110°F)
B. 49°C to 54°C (120°F to 130°F)
C. 60°C to 66°C (140°F to 150°F)
D. 83°C (180°F) Correct Ans-B
,An inverted sensor (measures water level) can be found operating what type of appliance?
A. Hot water boiler
B. Steam water boiler
C. Domestic hot water storage tank
D. Domestic potable hot water tank Correct Ans-D
A backflow prevent used in a hydronic heating system is used to:
A. Keep hot water from entering the cold water system
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of air
C. Prevent the heating water from circulating the wrong way in the system
D. Keep non-combustible water from entering the drinking water system Correct Ans-D
A low water cut off device on an automatically fired hot water heating boiler rated at 350,000
Btuh (102 kW) is:
A. Not required if a limit control is installed
B. Not required if it is installed in the industrial application
C. Required when any portion of the circulating system is located below the boiler
D. Required only in commercial applications Correct Ans-C
A pressure reducing valve
A. Relieves system pressure in excess of the set pressure
B. Reduces the city main pressure to a safe working pressure
C. Reduces the working pressure to the city main pressure
D. Prevents hot water gravity circulation Correct Ans-B
The maximum operating pressure of a low pressure steam boiler is
, A. 5 psig (35kPa)
B. 15 psig (100 kPa)
C. 100 psig (690 kPa)
D. 150 psig (1035 kPa) Correct Ans-B
A scotch marine boiler is what type of boiler?
A. Two pass boiler
B. Copper tube boiler
C. Fire tube boiler
D. Four pass water tube boiler Correct Ans-C
A fire tube boiler has:
A. Water outside the tube and flue gases outside
B. Water inside the tubes and flue gasses outside
C. Water inside the tubes and water outside
D. Water outside the tubes and flue gases inside Correct Ans-D
Why is a pressure relief valve installed on a pool heater system?
A. To maintain the pool water level
B. To prevent over pressurizing the filter
C. To prevent damage to the system
D. To relieve excess water pressure caused by solar gun Correct Ans-C
When does an electrically operated automatic vent damper on a mid-efficiency furnace open?
A. Before the ignition cycle
B. When the furnace is hot
C. At the same time as the gas comes on
Solutions
What type of room heater maybe installed in a bathroom?
A. Natural draft
B. Direct fired
C. Forced draft
D. Direct vent Correct Ans-D
What safety control protects a steam boiler if the condensate pump fails to return water to the
boiler?
A. High pressure limit control
B. Low pressure limit control
C. Flame safeguard control
D. Low water cut off Correct Ans-D
The relief valve for a residential low-pressure hot water boiler system should be?
A. 14.7 psia
B. 15 psia
C. 30 psig
D. 30 psia Correct Ans-C
A backflow prevent used in a boiler system should be located in the:
A. Over flow line connected to the drain
B. Return line close to the boiler
C. 1/4" line connecting the boiler and cushion tank
,D. Make up water line to the system Correct Ans-B
Automatic chlorinators must be installed:
A. upstream of the heater
B. downstream of the heater
C. upstream of the filter
D. downstream of the filter Correct Ans-B
On seasonal start up, a pool heater should run:
A. intermittently
B. continuously for 24 hours
C. continuously until the thermostat is satisfied
D. one hour on and one hour off until the thermostat is satisfied Correct Ans-C
Before lighting a burner in a steam boiler, ensure that:
A. there is water in the boiler
B. the temperature controller is set properly
C. the main burner test firing valve is turned on
D. the safety valves are open Correct Ans-A
The recommended water temperature setting from a mixing valve to the domestic water system
in combination heating systems that employ oil-fired water heaters for heating potable water
and for space heating is:
A. 43°C (110°F)
B. 49°C to 54°C (120°F to 130°F)
C. 60°C to 66°C (140°F to 150°F)
D. 83°C (180°F) Correct Ans-B
,An inverted sensor (measures water level) can be found operating what type of appliance?
A. Hot water boiler
B. Steam water boiler
C. Domestic hot water storage tank
D. Domestic potable hot water tank Correct Ans-D
A backflow prevent used in a hydronic heating system is used to:
A. Keep hot water from entering the cold water system
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of air
C. Prevent the heating water from circulating the wrong way in the system
D. Keep non-combustible water from entering the drinking water system Correct Ans-D
A low water cut off device on an automatically fired hot water heating boiler rated at 350,000
Btuh (102 kW) is:
A. Not required if a limit control is installed
B. Not required if it is installed in the industrial application
C. Required when any portion of the circulating system is located below the boiler
D. Required only in commercial applications Correct Ans-C
A pressure reducing valve
A. Relieves system pressure in excess of the set pressure
B. Reduces the city main pressure to a safe working pressure
C. Reduces the working pressure to the city main pressure
D. Prevents hot water gravity circulation Correct Ans-B
The maximum operating pressure of a low pressure steam boiler is
, A. 5 psig (35kPa)
B. 15 psig (100 kPa)
C. 100 psig (690 kPa)
D. 150 psig (1035 kPa) Correct Ans-B
A scotch marine boiler is what type of boiler?
A. Two pass boiler
B. Copper tube boiler
C. Fire tube boiler
D. Four pass water tube boiler Correct Ans-C
A fire tube boiler has:
A. Water outside the tube and flue gases outside
B. Water inside the tubes and flue gasses outside
C. Water inside the tubes and water outside
D. Water outside the tubes and flue gases inside Correct Ans-D
Why is a pressure relief valve installed on a pool heater system?
A. To maintain the pool water level
B. To prevent over pressurizing the filter
C. To prevent damage to the system
D. To relieve excess water pressure caused by solar gun Correct Ans-C
When does an electrically operated automatic vent damper on a mid-efficiency furnace open?
A. Before the ignition cycle
B. When the furnace is hot
C. At the same time as the gas comes on
