ESCO A/C Exam Questions and Answers With Verified Solutions 2025
heat which causes a change in temperature of a substance is called - ✔✔sensible heat
Heat added to a substance without a rise in temperature - ✔✔latent heat of vaporization
Heat added to the refrigerant in a vapor state after the evaporation process is called - ✔✔superheat
scroll compressor move refrigerant by - ✔✔involute spirals
the movement of heat by way of fluid is called - ✔✔convection
the movement of heat by direct contact is - ✔✔conduction
the standard unit for measuring the quantity of heat in a substance is - ✔✔btu
refrigerant gives up heat when - ✔✔it condenses
why must refrigerant in the suction line be slightly warmer than the saturation temperature? -
✔✔prevent liquid slugging of the compressor
the state of the refrigerant in the suction line should be - ✔✔low pressure / low temperature vapor
the state of the refrigerant entering the condenser is - ✔✔high pressure / highly superheated vaoor
the evaporator - ✔✔Transfers heat from the refrigerated space to the refrigerant
which of the following is not a thermodynamic property of refrigerants - ✔✔flammability
, The sequential order of steps in the vapor compressions process are - ✔✔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 - ✔✔201 psig
fan airflow pressures are usually measured in - ✔✔inches of water column
0 pounds per square inch absolute is - ✔✔A pressure which cannot be further reduced
0 pounds per square inch gauge is - ✔✔The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - ✔✔Dewpoint
temperature
compound pressure gauge measures - ✔✔pressure and vacuum
mechanical shaft seal is necessary on a - ✔✔Open Drive compressor
liquid slugging is - ✔✔liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor - ✔✔has an effect on compressor capacity
which of the following types of air conditioning compressor is is most energy efficient - ✔✔scroll
Which of the following represent the right order for the functions of a condenser - ✔✔de superheat,
condenses, sub cools
refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as liquid liquid from the
condenser subcooled 20°F and the pressure will be approximately - ✔✔87 psig
heat which causes a change in temperature of a substance is called - ✔✔sensible heat
Heat added to a substance without a rise in temperature - ✔✔latent heat of vaporization
Heat added to the refrigerant in a vapor state after the evaporation process is called - ✔✔superheat
scroll compressor move refrigerant by - ✔✔involute spirals
the movement of heat by way of fluid is called - ✔✔convection
the movement of heat by direct contact is - ✔✔conduction
the standard unit for measuring the quantity of heat in a substance is - ✔✔btu
refrigerant gives up heat when - ✔✔it condenses
why must refrigerant in the suction line be slightly warmer than the saturation temperature? -
✔✔prevent liquid slugging of the compressor
the state of the refrigerant in the suction line should be - ✔✔low pressure / low temperature vapor
the state of the refrigerant entering the condenser is - ✔✔high pressure / highly superheated vaoor
the evaporator - ✔✔Transfers heat from the refrigerated space to the refrigerant
which of the following is not a thermodynamic property of refrigerants - ✔✔flammability
, The sequential order of steps in the vapor compressions process are - ✔✔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 - ✔✔201 psig
fan airflow pressures are usually measured in - ✔✔inches of water column
0 pounds per square inch absolute is - ✔✔A pressure which cannot be further reduced
0 pounds per square inch gauge is - ✔✔The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - ✔✔Dewpoint
temperature
compound pressure gauge measures - ✔✔pressure and vacuum
mechanical shaft seal is necessary on a - ✔✔Open Drive compressor
liquid slugging is - ✔✔liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor - ✔✔has an effect on compressor capacity
which of the following types of air conditioning compressor is is most energy efficient - ✔✔scroll
Which of the following represent the right order for the functions of a condenser - ✔✔de superheat,
condenses, sub cools
refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as liquid liquid from the
condenser subcooled 20°F and the pressure will be approximately - ✔✔87 psig
