HVAC AC EXCELLENCE EXAM QUESTIONS
AND CORRECT ANSWERS
Heat which causes a change in temperature of a
substance is called - ANSWER -Sensible Heat
Heat added to a substance without a rise in temperature:
(example) liquid refrigerant to gas) this process is called -
ANSWER -Latent Heat of Vaporization
Heat added to a refrigerant in a vapor state after the
evaporation process is called? - ANSWER -Superheat
A scroll compressor mover refrigerant means of? -
ANSWER -Involutes spiral
,The movement of heat by way of fluid (or air) is called? -
ANSWER -Convection
The movement of heat by through a solid object is
callled? - ANSWER -Conduction
The standard unit for measuring the quantity of heat in a
substance is? - ANSWER -BTU British Thermal Unit
A refrigerant gives heat when - ANSWER -It Condenses
Why must refrigerant in the suction line be slightly
warmer than the saturation temperature? - ANSWER -
Prevent Liquid Slugging of the Compressor
The state of the refrigerant in the suction line should be -
ANSWER -Low Pressure/ Low Temperature Vapor
, The state of refrigerant entering the condenser is -
ANSWER -Low Pressure/ Low Temperature Vapor
The Evaporator - ANSWER -Transfers heat from the
refrigerated space to the refrigerant
Which of the following is not a thermodynamic property
of refrigerant? - ANSWER -Flammability
The sequential order of steps in the evaporator -
compressor are? - ANSWER -Compression,
Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaim R-410a refrigerant has
been stored over night at 70F, the pressure in the
cylinder should be approximately? - ANSWER -201 psig
Fan air flow pressure are usually measured in? - ANSWER
-Inches of Water Column
AND CORRECT ANSWERS
Heat which causes a change in temperature of a
substance is called - ANSWER -Sensible Heat
Heat added to a substance without a rise in temperature:
(example) liquid refrigerant to gas) this process is called -
ANSWER -Latent Heat of Vaporization
Heat added to a refrigerant in a vapor state after the
evaporation process is called? - ANSWER -Superheat
A scroll compressor mover refrigerant means of? -
ANSWER -Involutes spiral
,The movement of heat by way of fluid (or air) is called? -
ANSWER -Convection
The movement of heat by through a solid object is
callled? - ANSWER -Conduction
The standard unit for measuring the quantity of heat in a
substance is? - ANSWER -BTU British Thermal Unit
A refrigerant gives heat when - ANSWER -It Condenses
Why must refrigerant in the suction line be slightly
warmer than the saturation temperature? - ANSWER -
Prevent Liquid Slugging of the Compressor
The state of the refrigerant in the suction line should be -
ANSWER -Low Pressure/ Low Temperature Vapor
, The state of refrigerant entering the condenser is -
ANSWER -Low Pressure/ Low Temperature Vapor
The Evaporator - ANSWER -Transfers heat from the
refrigerated space to the refrigerant
Which of the following is not a thermodynamic property
of refrigerant? - ANSWER -Flammability
The sequential order of steps in the evaporator -
compressor are? - ANSWER -Compression,
Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaim R-410a refrigerant has
been stored over night at 70F, the pressure in the
cylinder should be approximately? - ANSWER -201 psig
Fan air flow pressure are usually measured in? - ANSWER
-Inches of Water Column
