ESCO AC TEST PREP QUESTIONS
AND CORRECT ANSWERS
The movement of heat by direct contact is ANSW✅✅Conduction
The standard unit for measuring the quantity of heat in a substance is ANSW✅✅BTUs
Refrigerant gives up heat when ANSW✅✅It condenses
Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
ANSW✅✅Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be ANSW✅✅Low pressure / Low
temperature vapor
The state of the refrigerant entering the condenser is ANSW✅✅High pressure / Highly
superheated vapor
The evaporator ANSW✅✅Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerants ANSW✅✅Critical Point
Heat which causes a change in temperature of a substance is called ANSW✅✅Sensible heat
Heat added to a substance without a rise in temperature ANSW✅✅Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called
ANSW✅✅Superheat
Scroll compressor move refrigerant by ANSW✅✅Involute Spirals
, The movement of heat by way of fluid is called ANSW✅✅Convection
The sequential order of steps in the vapor compressions process are ANSW✅✅Compression,
Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaimed R 410 a refrigerant has been stored overnight at 70° the pressure
in the cylinder should be approximately ANSW✅✅201 psig
Fan airflow pressures are usually measured in ANSW✅✅Inches of water column
0 pounds per square inch absolute is ANSW✅✅A pressure which cannot be further reduced
0 pounds per square inch gauge is ANSW✅✅The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called ANSW✅✅Dew
point temperature
A compound pressure gauge measures ANSW✅✅Pressure and vacuum
Mechanical shaft seal is necessary on a ANSW✅✅Open drive compressor
Liquid slugging is ANSW✅✅Liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor ANSW✅✅Has an effect on compressor capacity
Which of the following types of air conditioning compressor is most energy-efficient
ANSW✅✅Scroll
Which of the following represent the right order for the functions of a condenser ANSW✅✅De-
superheat, Condenses, Subcools
Refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as a liquid from the
condenser subcooled 20°F and the pressure will be approximately ANSW✅✅87 psig
AND CORRECT ANSWERS
The movement of heat by direct contact is ANSW✅✅Conduction
The standard unit for measuring the quantity of heat in a substance is ANSW✅✅BTUs
Refrigerant gives up heat when ANSW✅✅It condenses
Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
ANSW✅✅Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be ANSW✅✅Low pressure / Low
temperature vapor
The state of the refrigerant entering the condenser is ANSW✅✅High pressure / Highly
superheated vapor
The evaporator ANSW✅✅Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerants ANSW✅✅Critical Point
Heat which causes a change in temperature of a substance is called ANSW✅✅Sensible heat
Heat added to a substance without a rise in temperature ANSW✅✅Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called
ANSW✅✅Superheat
Scroll compressor move refrigerant by ANSW✅✅Involute Spirals
, The movement of heat by way of fluid is called ANSW✅✅Convection
The sequential order of steps in the vapor compressions process are ANSW✅✅Compression,
Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaimed R 410 a refrigerant has been stored overnight at 70° the pressure
in the cylinder should be approximately ANSW✅✅201 psig
Fan airflow pressures are usually measured in ANSW✅✅Inches of water column
0 pounds per square inch absolute is ANSW✅✅A pressure which cannot be further reduced
0 pounds per square inch gauge is ANSW✅✅The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called ANSW✅✅Dew
point temperature
A compound pressure gauge measures ANSW✅✅Pressure and vacuum
Mechanical shaft seal is necessary on a ANSW✅✅Open drive compressor
Liquid slugging is ANSW✅✅Liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor ANSW✅✅Has an effect on compressor capacity
Which of the following types of air conditioning compressor is most energy-efficient
ANSW✅✅Scroll
Which of the following represent the right order for the functions of a condenser ANSW✅✅De-
superheat, Condenses, Subcools
Refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as a liquid from the
condenser subcooled 20°F and the pressure will be approximately ANSW✅✅87 psig
