MECHANICAL LAW – MICHIGAN
FINAL TEST 2026 QUESTIONS WITH
CORRECT ANSWERS GRADED A+
◍ The best method to evaluate proper operation of a geothermal system is
___________..
Answer: - verify the water flow rate is correct by measuring pressure drop
through the heat exchanger- using the P/T plugs take the difference from the
input temperature and outlet temperature- checking the heat of extraction
(water side capacity in heating) and heat of rejection (water side capacity in
cooling) by using superheat and subcooling measurements
◍ What does humidity cause if formed inside the compressor?.
Answer: corrosion of metal parts inside the compressor
◍ According to Michigan Mechanical Code which two types of inert gasses
are approved for pressurizing refrigeration systems..
Answer: Carbon Dioxide / Nitrogen
◍ What group refrigerant has highest flammability?.
Answer: B2
◍ 70 degrees Fahrenheit is about the same as how many degrees Celsius?.
Answer: 21
◍ 28 degrees Celsius is equilateral to ______ degrees Fahrenheit..
Answer: 82
◍ On a low-pressure residential steam boiler, the relief device opens at?.
Answer: 15
◍ 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- volt 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 1.7MBTU?.
Answer: Mechanical Contractor Category 6
◍ A psychrometer is a ________?.
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 various property of air is plotted
◍ Combustion is what type of process?.
Answer: chemical
◍ What percentage of oxygen is in the air?.
Answer: 21 percent
◍ A hand shut off valve in a gas line is used to turn gas on and off to
________..
Answer: burner and pilot
◍ CGV is the abbreviation for __________..
Answer: combination gas valve
◍ The maximum safety drop out time for a thermo-couple 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 ohms
◍ 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 then the pipe which it connects
◍ All boilers shall have the potable water protected with ________?.
Answer: a back-flow preventer
◍ Compared to natural gas with the same BTU/h 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
◍ The pressure regulator on a LP gas system is set at __________?.
Answer: 11.0 w.c.
◍ A fast acting type of gas valve is the _________ valve?.
Answer: solenoid
◍ The air for combustion in a building must be at least one square inch per?.
Answer: 1,000 btu/h
◍ Which pipe has the thickest wall?.
Answer: Schedule 80
◍ Ducts shall be supported at intervals of _____?.
Answer: 10 ( in accordance with smascna duct construction standards metal
FINAL TEST 2026 QUESTIONS WITH
CORRECT ANSWERS GRADED A+
◍ The best method to evaluate proper operation of a geothermal system is
___________..
Answer: - verify the water flow rate is correct by measuring pressure drop
through the heat exchanger- using the P/T plugs take the difference from the
input temperature and outlet temperature- checking the heat of extraction
(water side capacity in heating) and heat of rejection (water side capacity in
cooling) by using superheat and subcooling measurements
◍ What does humidity cause if formed inside the compressor?.
Answer: corrosion of metal parts inside the compressor
◍ According to Michigan Mechanical Code which two types of inert gasses
are approved for pressurizing refrigeration systems..
Answer: Carbon Dioxide / Nitrogen
◍ What group refrigerant has highest flammability?.
Answer: B2
◍ 70 degrees Fahrenheit is about the same as how many degrees Celsius?.
Answer: 21
◍ 28 degrees Celsius is equilateral to ______ degrees Fahrenheit..
Answer: 82
◍ On a low-pressure residential steam boiler, the relief device opens at?.
Answer: 15
◍ 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- volt 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 1.7MBTU?.
Answer: Mechanical Contractor Category 6
◍ A psychrometer is a ________?.
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 various property of air is plotted
◍ Combustion is what type of process?.
Answer: chemical
◍ What percentage of oxygen is in the air?.
Answer: 21 percent
◍ A hand shut off valve in a gas line is used to turn gas on and off to
________..
Answer: burner and pilot
◍ CGV is the abbreviation for __________..
Answer: combination gas valve
◍ The maximum safety drop out time for a thermo-couple 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 ohms
◍ 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 then the pipe which it connects
◍ All boilers shall have the potable water protected with ________?.
Answer: a back-flow preventer
◍ Compared to natural gas with the same BTU/h 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
◍ The pressure regulator on a LP gas system is set at __________?.
Answer: 11.0 w.c.
◍ A fast acting type of gas valve is the _________ valve?.
Answer: solenoid
◍ The air for combustion in a building must be at least one square inch per?.
Answer: 1,000 btu/h
◍ Which pipe has the thickest wall?.
Answer: Schedule 80
◍ Ducts shall be supported at intervals of _____?.
Answer: 10 ( in accordance with smascna duct construction standards metal
