ESCO Refrigeration Exam Questions and Answers With Verified Solutions 2025
Heat which is added to a vapor after the change of state occurs is called - ✔✔superheat
A refrigerant gives up heat when; - ✔✔it condenses
it is desirable for refrigerant in the suction line to be slightly superheated in order to... - ✔✔ensure
liquid refrigerant does not enter the compressor
state of refrigerant in the suction line should be... - ✔✔low pressure/ low temperature vapor
state of refrigerant entering the condenser is... - ✔✔high pressure/ highly superheated vapor
the evaporator... - ✔✔Transfers heat from the refrigerated space to the refrigerant
which is not a thermodynamic property of refrigerants - ✔✔flammability
Zero psia (pounds per square inch absolute) is; - ✔✔a pressure which cannot be further reduced
zero psig is the same as - ✔✔atmospheric pressure
the temperature at which moisture will start to condense from the air is called... - ✔✔dew point
temperature
a compound pressure gauge measures... - ✔✔pressure and vacuum
the main function of the condenser is to... - ✔✔To remove heat from the refrigerant
The heat removed from the refrigerant by the condenser is; - ✔✔Both sensible and latent heat.
, in the evaporator... - ✔✔latent heat is transferred from the refrigerated space to the refrigerant
an overcharge of refrigerant will cause... - ✔✔increased head pressure
the clearance space in a reciprocating compressor... - ✔✔has no effect on compressor capacity
which of the following types of air conditioning compressors is most energy efficient - ✔✔centrifugal
the main function of the condenser is to... - ✔✔To remove heat from the refrigerant
Refrigerant R-134a vapor enters the condenser at 124psig, 100°F. it leaves the condenser at 80°F. its
pressure will be approximately... - ✔✔124psig
three basic types of condensers are water cooled, air cooled, and ___ cooled. - ✔✔evaporative
10 lbs. of refrigerant passing through a water cooled condenser will lose 20 btu's of heat per lb. if 10lbs
of water passes through the condenser with an entering air temperature of 80°F. the temperature of the
water leaving the condenser is... - ✔✔100°F
which of the following can not be used as a low ambient temperature control - ✔✔crankcase regulating
valve
when testing the efficiency of an AIR COOLED condenser, the refrigerant condensing temperature
should be no more than ___ higher than the leaving air temperature - ✔✔approximately 30°F
when testing the efficiency of a WATER COOLED condenser, the refrigerant condensing temperature
should be no more than ___ higher than the leaving water temperature - ✔✔approximately 10°F
the first function the condenser must perform is to ___ the refrigerant before condensing can occur -
✔✔de-superheat
Heat which is added to a vapor after the change of state occurs is called - ✔✔superheat
A refrigerant gives up heat when; - ✔✔it condenses
it is desirable for refrigerant in the suction line to be slightly superheated in order to... - ✔✔ensure
liquid refrigerant does not enter the compressor
state of refrigerant in the suction line should be... - ✔✔low pressure/ low temperature vapor
state of refrigerant entering the condenser is... - ✔✔high pressure/ highly superheated vapor
the evaporator... - ✔✔Transfers heat from the refrigerated space to the refrigerant
which is not a thermodynamic property of refrigerants - ✔✔flammability
Zero psia (pounds per square inch absolute) is; - ✔✔a pressure which cannot be further reduced
zero psig is the same as - ✔✔atmospheric pressure
the temperature at which moisture will start to condense from the air is called... - ✔✔dew point
temperature
a compound pressure gauge measures... - ✔✔pressure and vacuum
the main function of the condenser is to... - ✔✔To remove heat from the refrigerant
The heat removed from the refrigerant by the condenser is; - ✔✔Both sensible and latent heat.
, in the evaporator... - ✔✔latent heat is transferred from the refrigerated space to the refrigerant
an overcharge of refrigerant will cause... - ✔✔increased head pressure
the clearance space in a reciprocating compressor... - ✔✔has no effect on compressor capacity
which of the following types of air conditioning compressors is most energy efficient - ✔✔centrifugal
the main function of the condenser is to... - ✔✔To remove heat from the refrigerant
Refrigerant R-134a vapor enters the condenser at 124psig, 100°F. it leaves the condenser at 80°F. its
pressure will be approximately... - ✔✔124psig
three basic types of condensers are water cooled, air cooled, and ___ cooled. - ✔✔evaporative
10 lbs. of refrigerant passing through a water cooled condenser will lose 20 btu's of heat per lb. if 10lbs
of water passes through the condenser with an entering air temperature of 80°F. the temperature of the
water leaving the condenser is... - ✔✔100°F
which of the following can not be used as a low ambient temperature control - ✔✔crankcase regulating
valve
when testing the efficiency of an AIR COOLED condenser, the refrigerant condensing temperature
should be no more than ___ higher than the leaving air temperature - ✔✔approximately 30°F
when testing the efficiency of a WATER COOLED condenser, the refrigerant condensing temperature
should be no more than ___ higher than the leaving water temperature - ✔✔approximately 10°F
the first function the condenser must perform is to ___ the refrigerant before condensing can occur -
✔✔de-superheat
