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HVAC/R AIR CONDITIONING FINAL exam Questions
Newest Updated Exam 2026 Solved Questions &
Answers Verified 100% Graded A+ (Latest Version)
It is desirable for refrigerant in the suction line to be slightly superheated in
order to;
A) ensure liquid refrigerant does not enter the compressor.
B) prevent vapor refrigerant from entering the compressor.
C) keep the compressor warm.
D) prevent vapor refrigerant from entering the condenser.
A) ensure liquid refrigerant does not enter the compressor.
The state of the refrigerant in the suction line should be;
A) high pressure high temperature liquid
B) high pressure / low temperature vapor.
C) low pressure / low temperature liquid
D) low pressure / low temperature vapor.
D) low pressure / low temperature vapor.
The state of the refrigerant entering the condenser is;
A) high pressure / highly superheated liquid.
B) high pressure / highly superheated vapor.
C) high pressure high temperature liquid.
D) low pressure / low temperature vapor.
B) high pressure / highly superheated vapor.
The evaporator;
A) transfers heat from the refrigerated space to the refrigerant.
B) transfers heat from the refrigerant to the refrigerated space.
C) transfers heat from the refrigerant to the ambient air.
D) transfers heat from the ambient air to the refrigerated space.
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A) transfers heat from the refrigerated space to the refrigerant.
Which of the following is NOT a thermodynamic property of refrigerants?
A) Critical point.
B) Saturation point.
C) Enthalpy.
D) Flammability.
D) Flammability.
The sequential order of steps in the vapor - compression process are;
A) expansion, condensation, compression, vaporization.
B) vaporization, expansion, condensation, compression.
C) compression, condensation, expansion, vaporization.
D) expansion, compression, vaporization, condensation.
C) compression, condensation, expansion, vaporization.
If a 30 pound cylinder of reclaimed R-410A refrigerant has been stored over
night at 70° F, the pressure in the cylinder should be approximately;
A) 201 psig
B) 168 psig
C) 143 psig
D) 118 psig.
A) 201 psig
Fan airflow pressures are usually measured in;
A) inches of mercury vacuum or microns.
B) microns or psig.
C) psig or inches of mercury vacuum.
D) inches of water column (WC).
D) inches of water column (WC).
Zero psia (pounds per square inch absolute) is;
A) the same as atmospheric pressure.
B) approximately 14.7 psi. at sea-level.
C) a pressure which cannot be further reduced.
D) equal to 500 microns.
B) approximately 14.7 psi. at sea-level.
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Zero psig (pounds per square inch gauge) is;
A) 25,400 microns.
B) approximately 29.9 psia at sea-level.
C) a pressure which cannot be further reduced.
D) the same as atmospheric pressure.
D) the same as atmospheric pressure.
The temperature at which moisture will start to condense from the air is called;
A) dry bulb temperature.
B) wet bulb depression.
C) dew point temperature.
D) condensate point.
C) dew point temperature.
A compound pressure gauge measures;
A) pressure and vacuum.
B) pressure and temperature.
C) pressure and humidity.
D) wet and dry bulb temperatures.
A) pressure and vacuum.
A mechanical shaft seal is necessary on a;
A) semi-hermetic compressor.
B) hermetic reciprocating compressor.
C) hermetic rotary compressor.
D) open drive compressor.
D) open drive compressor.
Liquid slugging is;
A) a pounding noise caused by liquid refrigerant in the suction line at the point
of a restriction.
B) noise caused by excessive liquid refrigerant in the condenser.
C) liquid refrigerant in the compressor clearance space.
D. excessive liquid refrigerant in the receiver.
C) liquid refrigerant in the compressor clearance space.
The clearance space in a reciprocating compressor;
A) has no effect on compressor capacity. B) has an effect on compressor
HVAC/R AIR CONDITIONING FINAL exam Questions
Newest Updated Exam 2026 Solved Questions &
Answers Verified 100% Graded A+ (Latest Version)
It is desirable for refrigerant in the suction line to be slightly superheated in
order to;
A) ensure liquid refrigerant does not enter the compressor.
B) prevent vapor refrigerant from entering the compressor.
C) keep the compressor warm.
D) prevent vapor refrigerant from entering the condenser.
A) ensure liquid refrigerant does not enter the compressor.
The state of the refrigerant in the suction line should be;
A) high pressure high temperature liquid
B) high pressure / low temperature vapor.
C) low pressure / low temperature liquid
D) low pressure / low temperature vapor.
D) low pressure / low temperature vapor.
The state of the refrigerant entering the condenser is;
A) high pressure / highly superheated liquid.
B) high pressure / highly superheated vapor.
C) high pressure high temperature liquid.
D) low pressure / low temperature vapor.
B) high pressure / highly superheated vapor.
The evaporator;
A) transfers heat from the refrigerated space to the refrigerant.
B) transfers heat from the refrigerant to the refrigerated space.
C) transfers heat from the refrigerant to the ambient air.
D) transfers heat from the ambient air to the refrigerated space.
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A) transfers heat from the refrigerated space to the refrigerant.
Which of the following is NOT a thermodynamic property of refrigerants?
A) Critical point.
B) Saturation point.
C) Enthalpy.
D) Flammability.
D) Flammability.
The sequential order of steps in the vapor - compression process are;
A) expansion, condensation, compression, vaporization.
B) vaporization, expansion, condensation, compression.
C) compression, condensation, expansion, vaporization.
D) expansion, compression, vaporization, condensation.
C) compression, condensation, expansion, vaporization.
If a 30 pound cylinder of reclaimed R-410A refrigerant has been stored over
night at 70° F, the pressure in the cylinder should be approximately;
A) 201 psig
B) 168 psig
C) 143 psig
D) 118 psig.
A) 201 psig
Fan airflow pressures are usually measured in;
A) inches of mercury vacuum or microns.
B) microns or psig.
C) psig or inches of mercury vacuum.
D) inches of water column (WC).
D) inches of water column (WC).
Zero psia (pounds per square inch absolute) is;
A) the same as atmospheric pressure.
B) approximately 14.7 psi. at sea-level.
C) a pressure which cannot be further reduced.
D) equal to 500 microns.
B) approximately 14.7 psi. at sea-level.
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Zero psig (pounds per square inch gauge) is;
A) 25,400 microns.
B) approximately 29.9 psia at sea-level.
C) a pressure which cannot be further reduced.
D) the same as atmospheric pressure.
D) the same as atmospheric pressure.
The temperature at which moisture will start to condense from the air is called;
A) dry bulb temperature.
B) wet bulb depression.
C) dew point temperature.
D) condensate point.
C) dew point temperature.
A compound pressure gauge measures;
A) pressure and vacuum.
B) pressure and temperature.
C) pressure and humidity.
D) wet and dry bulb temperatures.
A) pressure and vacuum.
A mechanical shaft seal is necessary on a;
A) semi-hermetic compressor.
B) hermetic reciprocating compressor.
C) hermetic rotary compressor.
D) open drive compressor.
D) open drive compressor.
Liquid slugging is;
A) a pounding noise caused by liquid refrigerant in the suction line at the point
of a restriction.
B) noise caused by excessive liquid refrigerant in the condenser.
C) liquid refrigerant in the compressor clearance space.
D. excessive liquid refrigerant in the receiver.
C) liquid refrigerant in the compressor clearance space.
The clearance space in a reciprocating compressor;
A) has no effect on compressor capacity. B) has an effect on compressor
