HEATING SERVICE EXAM 2025
QUESTIONS AND ANSWERS
On a low pressure residential steam boiler the release device opens at? - ANS 15 pounds
If too much primary air is used the flame will - ANS Lift off the burner
What operates the heat anticipator in a low voltage thermostat - ANS 24 volts a/c
A limit control is located where in the electrical circuit - ANS Either the 24 or 120 V circuit
What is the usual oil pressure at the nozzle in a high pressure gun type oil burner - ANS 100
PSIG
What license is required to perform a CSD-1 on a boiler that has an input rating of 1.7 MBTU -
ANS Mechanical contractor category 6
A psychrometer meter is what ? - ANS A Hygrometer consisting of a wet-bulb and dry-bulb
Thermometer, The difference in the two readings used to determine the atmospheric humidity
A psychrometric chart is a - ANS Chart where the various property of air is plotted
Combustion is what type of process - ANS chemical
What percentage of oxygen is in the air - ANS 21%
1|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
, A hand shut off valve in a gas line is used to turn gas on and off to - ANS A burner and pilot
CGV is the abbreviation for - ANS Combustion gas valve
The maximum safety drop out time for a thermocouple is - ANS Three minutes
The bimetallic Strip of metal in a thermostat is made of copper and ? - ANS Invar
What is the light sensitive material used in a cad cell - ANS Cadmium sulphide
What is the resistance measured in a cad cell in the absence of light - ANS 100,000
When operating a fuel oil furnace with a one pipe system what needs to take place at the fuel
pump ? - ANS Bypass plug should not be installed
A gas drip leg must ? - ANS Not be smaller in diameter than the pipe which it connects
All boilers shall have the portable water protected with - ANS A backflow preventer
Compared to national gas with the same BTU rating, the orifice opening in an LP gas fire furnace
is ? - ANS Smaller
A thermostat that cycles too often or not enough indicates - ANS Improper heat anticipator
setting
The pressure regulator on a LP gas system is set at - ANS 11.0 w.c
A fast acting type of gas valve is the _________ valve ? - ANS Solenoid
2|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
QUESTIONS AND ANSWERS
On a low pressure residential steam boiler the release device opens at? - ANS 15 pounds
If too much primary air is used the flame will - ANS Lift off the burner
What operates the heat anticipator in a low voltage thermostat - ANS 24 volts a/c
A limit control is located where in the electrical circuit - ANS Either the 24 or 120 V circuit
What is the usual oil pressure at the nozzle in a high pressure gun type oil burner - ANS 100
PSIG
What license is required to perform a CSD-1 on a boiler that has an input rating of 1.7 MBTU -
ANS Mechanical contractor category 6
A psychrometer meter is what ? - ANS A Hygrometer consisting of a wet-bulb and dry-bulb
Thermometer, The difference in the two readings used to determine the atmospheric humidity
A psychrometric chart is a - ANS Chart where the various property of air is plotted
Combustion is what type of process - ANS chemical
What percentage of oxygen is in the air - ANS 21%
1|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
, A hand shut off valve in a gas line is used to turn gas on and off to - ANS A burner and pilot
CGV is the abbreviation for - ANS Combustion gas valve
The maximum safety drop out time for a thermocouple is - ANS Three minutes
The bimetallic Strip of metal in a thermostat is made of copper and ? - ANS Invar
What is the light sensitive material used in a cad cell - ANS Cadmium sulphide
What is the resistance measured in a cad cell in the absence of light - ANS 100,000
When operating a fuel oil furnace with a one pipe system what needs to take place at the fuel
pump ? - ANS Bypass plug should not be installed
A gas drip leg must ? - ANS Not be smaller in diameter than the pipe which it connects
All boilers shall have the portable water protected with - ANS A backflow preventer
Compared to national gas with the same BTU rating, the orifice opening in an LP gas fire furnace
is ? - ANS Smaller
A thermostat that cycles too often or not enough indicates - ANS Improper heat anticipator
setting
The pressure regulator on a LP gas system is set at - ANS 11.0 w.c
A fast acting type of gas valve is the _________ valve ? - ANS Solenoid
2|P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D
