HOSMERIT
HEATING SERVICE EXAM MICHIGAN WITH
CORRECT ANSWERS 2025
On a low pressure residential steam boiler the release device opens at? - ANSWER-15 pounds
If too much primary air is used the flame will - ANSWER-Lift off the burner
What operates the heat anticipator in a low voltage thermostat - ANSWER-24 volts a/c
A limit control is located where in the electrical circuit - ANSWER-Either the 24 or 120 V
circuit
What is the usual oil pressure at the nozzle in a high pressure gun type oil burner - ANSWER-
100 PSIG
What license is required to perform a CSD-1 on a boiler that has an input rating of 1.7 MBTU -
ANSWER-Mechanical contractor category 6
A psychrometer meter is what ? - ANSWER-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 - ANSWER-Chart where the various property of air is plotted
Combustion is what type of process - ANSWER-chemical
What percentage of oxygen is in the air - ANSWER-21%
, A hand shut off valve in a gas line is used to turn gas on and off to - ANSWER-A burner and
pilot
CGV is the abbreviation for - ANSWER-Combustion gas valve
The maximum safety drop out time for a thermocouple is - ANSWER-Three minutes
The bimetallic Strip of metal in a thermostat is made of copper and ? - ANSWER-Invar
What is the light sensitive material used in a cad cell - ANSWER-Cadmium sulphide
What is the resistance measured in a cad cell in the absence of light - ANSWER-100,000
When operating a fuel oil furnace with a one pipe system what needs to take place at the fuel
pump ? - ANSWER-Bypass plug should not be installed
A gas drip leg must ? - ANSWER-Not be smaller in diameter than the pipe which it connects
All boilers shall have the portable water protected with - ANSWER-A backflow preventer
Compared to national gas with the same BTU rating, the orifice opening in an LP gas fire
furnace is ? - ANSWER-Smaller
A thermostat that cycles too often or not enough indicates - ANSWER-Improper heat
anticipator setting
A gas space heater that operates with no external power source would be operating on -
ANSWER-Millivolts
What drives the oil pump on a oil fired furnace - ANSWER-Burner motor
HEATING SERVICE EXAM MICHIGAN WITH
CORRECT ANSWERS 2025
On a low pressure residential steam boiler the release device opens at? - ANSWER-15 pounds
If too much primary air is used the flame will - ANSWER-Lift off the burner
What operates the heat anticipator in a low voltage thermostat - ANSWER-24 volts a/c
A limit control is located where in the electrical circuit - ANSWER-Either the 24 or 120 V
circuit
What is the usual oil pressure at the nozzle in a high pressure gun type oil burner - ANSWER-
100 PSIG
What license is required to perform a CSD-1 on a boiler that has an input rating of 1.7 MBTU -
ANSWER-Mechanical contractor category 6
A psychrometer meter is what ? - ANSWER-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 - ANSWER-Chart where the various property of air is plotted
Combustion is what type of process - ANSWER-chemical
What percentage of oxygen is in the air - ANSWER-21%
, A hand shut off valve in a gas line is used to turn gas on and off to - ANSWER-A burner and
pilot
CGV is the abbreviation for - ANSWER-Combustion gas valve
The maximum safety drop out time for a thermocouple is - ANSWER-Three minutes
The bimetallic Strip of metal in a thermostat is made of copper and ? - ANSWER-Invar
What is the light sensitive material used in a cad cell - ANSWER-Cadmium sulphide
What is the resistance measured in a cad cell in the absence of light - ANSWER-100,000
When operating a fuel oil furnace with a one pipe system what needs to take place at the fuel
pump ? - ANSWER-Bypass plug should not be installed
A gas drip leg must ? - ANSWER-Not be smaller in diameter than the pipe which it connects
All boilers shall have the portable water protected with - ANSWER-A backflow preventer
Compared to national gas with the same BTU rating, the orifice opening in an LP gas fire
furnace is ? - ANSWER-Smaller
A thermostat that cycles too often or not enough indicates - ANSWER-Improper heat
anticipator setting
A gas space heater that operates with no external power source would be operating on -
ANSWER-Millivolts
What drives the oil pump on a oil fired furnace - ANSWER-Burner motor
