Refrigeration ESCO Exam – Latest Exam Prep
2025/2026 | Practice Questions & Study Guide
Heat which is added to a vapor after the change of state occurs is called - correct
answersuperheat
A refrigerant gives up heat when; - correct answerit condenses
it is desirable for refrigerant in the suction line to be slightly superheated in order to... -
correct answerensure liquid refrigerant does not enter the compressor
state of refrigerant in the suction line should be... - correct answerlow pressure/ low
temperature vapor
state of refrigerant entering the condenser is... - correct answerhigh pressure/ highly
superheated vapor
the evaporator... - correct answerTransfers heat from the refrigerated space to the
refrigerant
which is not a thermodynamic property of refrigerants - correct answerflammability
Zero psia (pounds per square inch absolute) is; - correct answera pressure which
cannot be further reduced
zero psig is the same as - correct answeratmospheric pressure
the temperature at which moisture will start to condense from the air is called... - correct
answerdew point temperature
a compound pressure gauge measures... - correct answerpressure and vacuum
the main function of the condenser is to... - correct answerTo remove heat from the
refrigerant
The heat removed from the refrigerant by the condenser is; - correct answerBoth
sensible and latent heat.
in the evaporator... - correct answerlatent heat is transferred from the refrigerated space
to the refrigerant
, an overcharge of refrigerant will cause... - correct answerincreased head pressure
the clearance space in a reciprocating compressor... - correct answerhas no effect on
compressor capacity
which of the following types of air conditioning compressors is most energy efficient -
correct answercentrifugal
the main function of the condenser is to... - correct answerTo 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... - correct answer124psig
three basic types of condensers are water cooled, air cooled, and ___ cooled. - correct
answerevaporative
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... - correct answer100°F
which of the following can not be used as a low ambient temperature control - correct
answercrankcase 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 -
correct answerapproximately 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 - correct answerapproximately 10°F
the first function the condenser must perform is to ___ the refrigerant before condensing
can occur - correct answerde-superheat
A TXV is designed to maintain... - correct answerconstant evaporator superheat
the AXV is designed to maintain... - correct answerconstant evaporator pressure
A TXV has three operating pressures... - correct answerevaporator pressure, spring
pressure, and suction bulb pressure
when mounting a TXV sensor bulb, which of the following is NOT true - correct answerit
must be installed lower than the valve body
2025/2026 | Practice Questions & Study Guide
Heat which is added to a vapor after the change of state occurs is called - correct
answersuperheat
A refrigerant gives up heat when; - correct answerit condenses
it is desirable for refrigerant in the suction line to be slightly superheated in order to... -
correct answerensure liquid refrigerant does not enter the compressor
state of refrigerant in the suction line should be... - correct answerlow pressure/ low
temperature vapor
state of refrigerant entering the condenser is... - correct answerhigh pressure/ highly
superheated vapor
the evaporator... - correct answerTransfers heat from the refrigerated space to the
refrigerant
which is not a thermodynamic property of refrigerants - correct answerflammability
Zero psia (pounds per square inch absolute) is; - correct answera pressure which
cannot be further reduced
zero psig is the same as - correct answeratmospheric pressure
the temperature at which moisture will start to condense from the air is called... - correct
answerdew point temperature
a compound pressure gauge measures... - correct answerpressure and vacuum
the main function of the condenser is to... - correct answerTo remove heat from the
refrigerant
The heat removed from the refrigerant by the condenser is; - correct answerBoth
sensible and latent heat.
in the evaporator... - correct answerlatent heat is transferred from the refrigerated space
to the refrigerant
, an overcharge of refrigerant will cause... - correct answerincreased head pressure
the clearance space in a reciprocating compressor... - correct answerhas no effect on
compressor capacity
which of the following types of air conditioning compressors is most energy efficient -
correct answercentrifugal
the main function of the condenser is to... - correct answerTo 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... - correct answer124psig
three basic types of condensers are water cooled, air cooled, and ___ cooled. - correct
answerevaporative
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... - correct answer100°F
which of the following can not be used as a low ambient temperature control - correct
answercrankcase 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 -
correct answerapproximately 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 - correct answerapproximately 10°F
the first function the condenser must perform is to ___ the refrigerant before condensing
can occur - correct answerde-superheat
A TXV is designed to maintain... - correct answerconstant evaporator superheat
the AXV is designed to maintain... - correct answerconstant evaporator pressure
A TXV has three operating pressures... - correct answerevaporator pressure, spring
pressure, and suction bulb pressure
when mounting a TXV sensor bulb, which of the following is NOT true - correct answerit
must be installed lower than the valve body
