REFRIGERATION ESCO EXAM WITH
ALL ANSWERS
Heat which is added to a vapor after the change of state occurs is called - correct
answer-superheat
A refrigerant gives up heat when; - correct answer-it condenses
it is desirable for refrigerant in the suction line to be slightly superheated in order to... -
correct answer-ensure liquid refrigerant does not enter the compressor
state of refrigerant in the suction line should be... - correct answer-low pressure/ low
temperature vapor
state of refrigerant entering the condenser is... - correct answer-high pressure/ highly
superheated vapor
the evaporator... - correct answer-Transfers heat from the refrigerated space to the
refrigerant
which is not a thermodynamic property of refrigerants - correct answer-flammability
Zero psia (pounds per square inch absolute) is; - correct answer-a pressure which
cannot be further reduced
zero psig is the same as - correct answer-atmospheric pressure
the temperature at which moisture will start to condense from the air is called... - correct
answer-dew point temperature
a compound pressure gauge measures... - correct answer-pressure and vacuum
, the main function of the condenser is to... - correct answer-To remove heat from the
refrigerant
The heat removed from the refrigerant by the condenser is; - correct answer-Both
sensible and latent heat.
in the evaporator... - correct answer-latent heat is transferred from the refrigerated
space to the refrigerant
an overcharge of refrigerant will cause... - correct answer-increased head pressure
the clearance space in a reciprocating compressor... - correct answer-has no effect on
compressor capacity
which of the following types of air conditioning compressors is most energy efficient -
correct answer-centrifugal
the main function of the condenser is to... - correct answer-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... - correct answer-124psig
three basic types of condensers are water cooled, air cooled, and ___ cooled. - correct
answer-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... - correct answer-100°F
which of the following can not be used as a low ambient temperature control - correct
answer-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 -
correct answer-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 - correct answer-approximately 10°F
the first function the condenser must perform is to ___ the refrigerant before
condensing can occur - correct answer-de-superheat
A TXV is designed to maintain... - correct answer-constant evaporator superheat
the AXV is designed to maintain... - correct answer-constant evaporator pressure
A TXV has three operating pressures... - correct answer-evaporator pressure, spring
pressure, and suction bulb pressure
ALL ANSWERS
Heat which is added to a vapor after the change of state occurs is called - correct
answer-superheat
A refrigerant gives up heat when; - correct answer-it condenses
it is desirable for refrigerant in the suction line to be slightly superheated in order to... -
correct answer-ensure liquid refrigerant does not enter the compressor
state of refrigerant in the suction line should be... - correct answer-low pressure/ low
temperature vapor
state of refrigerant entering the condenser is... - correct answer-high pressure/ highly
superheated vapor
the evaporator... - correct answer-Transfers heat from the refrigerated space to the
refrigerant
which is not a thermodynamic property of refrigerants - correct answer-flammability
Zero psia (pounds per square inch absolute) is; - correct answer-a pressure which
cannot be further reduced
zero psig is the same as - correct answer-atmospheric pressure
the temperature at which moisture will start to condense from the air is called... - correct
answer-dew point temperature
a compound pressure gauge measures... - correct answer-pressure and vacuum
, the main function of the condenser is to... - correct answer-To remove heat from the
refrigerant
The heat removed from the refrigerant by the condenser is; - correct answer-Both
sensible and latent heat.
in the evaporator... - correct answer-latent heat is transferred from the refrigerated
space to the refrigerant
an overcharge of refrigerant will cause... - correct answer-increased head pressure
the clearance space in a reciprocating compressor... - correct answer-has no effect on
compressor capacity
which of the following types of air conditioning compressors is most energy efficient -
correct answer-centrifugal
the main function of the condenser is to... - correct answer-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... - correct answer-124psig
three basic types of condensers are water cooled, air cooled, and ___ cooled. - correct
answer-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... - correct answer-100°F
which of the following can not be used as a low ambient temperature control - correct
answer-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 -
correct answer-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 - correct answer-approximately 10°F
the first function the condenser must perform is to ___ the refrigerant before
condensing can occur - correct answer-de-superheat
A TXV is designed to maintain... - correct answer-constant evaporator superheat
the AXV is designed to maintain... - correct answer-constant evaporator pressure
A TXV has three operating pressures... - correct answer-evaporator pressure, spring
pressure, and suction bulb pressure
