ESCO AC test prep Questions with Correct Verified
Answers
Heat which causes a change in temperature of a substance is called - ANS Sensible heat
Heat added to a substance without a rise in temperature - ANS Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called -
ANS Superheat
Scroll compressor move refrigerant by - ANS Involute Spirals
The movement of heat by way of fluid is called - ANS Convection
The movement of heat by direct contact is - ANS Conduction
The standard unit for measuring the quantity of heat in a substance is - ANS BTUs
Refrigerant gives up heat when - ANS It condenses
Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? - ANS Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be - ANS Low pressure / Low
temperature vapor
, The state of the refrigerant entering the condenser is - ANS High pressure / Highly
superheated vapor
The evaporator - ANS Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerants - ANS Critical
Point
The sequential order of steps in the vapor compressions process are - ANS 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 - ANS 201 psig
Fan airflow pressures are usually measured in - ANS Inches of water column
0 pounds per square inch absolute is - ANS A pressure which cannot be further reduced
0 pounds per square inch gauge is - ANS The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - ANS
Dew point temperature
A compound pressure gauge measures - ANS Pressure and vacuum
Mechanical shaft seal is necessary on a - ANS Open drive compressor
Answers
Heat which causes a change in temperature of a substance is called - ANS Sensible heat
Heat added to a substance without a rise in temperature - ANS Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called -
ANS Superheat
Scroll compressor move refrigerant by - ANS Involute Spirals
The movement of heat by way of fluid is called - ANS Convection
The movement of heat by direct contact is - ANS Conduction
The standard unit for measuring the quantity of heat in a substance is - ANS BTUs
Refrigerant gives up heat when - ANS It condenses
Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? - ANS Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be - ANS Low pressure / Low
temperature vapor
, The state of the refrigerant entering the condenser is - ANS High pressure / Highly
superheated vapor
The evaporator - ANS Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerants - ANS Critical
Point
The sequential order of steps in the vapor compressions process are - ANS 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 - ANS 201 psig
Fan airflow pressures are usually measured in - ANS Inches of water column
0 pounds per square inch absolute is - ANS A pressure which cannot be further reduced
0 pounds per square inch gauge is - ANS The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - ANS
Dew point temperature
A compound pressure gauge measures - ANS Pressure and vacuum
Mechanical shaft seal is necessary on a - ANS Open drive compressor
