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单选题
The low pressure side of a refrigeration system is considered to exist from the （）.
A
expansion valve to the compressor
B
receiver to the expansion coil
C
expansion valve to the evaporator
D
condenser to the expansion valve
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an electric system managerB
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pressure changes in the suction lineD
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单选题In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）A
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be light greenD
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单选题In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.A
compressor；condenserB
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evaporator；condenser
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单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.A
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high pressure switch was improperly adjustedC
expansion valve strainers were fouledD
suction valves were leaking slightly
考题
单选题If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.A
system was overcharged with refrigerantB
system was low on refrigerantC
suction valves were leaking slightlyD
relief valve was leaking slightly
考题
单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
passing it through the expansion valveB
condensing refrigerant in the system condenserC
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD
maintaining a high pressure on the systems receiver
考题
单选题The presence of air in the condenser of a refrigeration system will （） the condensing pressure.A
increaseB
reduceC
maintain constantD
None of the above is true
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单选题The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch， One reason for this could be the （）.A
system is low on refrigerantB
high pressure cutout switch is improperly adjustedC
discharge valves are leaking slightlyD
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单选题A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.A
high pressure liquid lineB
low pressure liquid lineC
high pressure vapor lineD
low pressure vapor line
考题
单选题Which cause of following will not lead to refrigeration plant short-cycle?（）A
lack of refrigerantB
refrigerant with much waterC
set defectively low pressure relayD
no cooling water
考题
单选题Which instrument is used to predict the approach of a low pressure system（）.A
AnemometerB
FathometerC
BarometerD
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考题
单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）A
Condenser and thermal expansion valveB
King and solenoid valvesC
Compressor and thermal expansion valveD
Condenser and solenoid valve
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单选题The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）A
system is overcharged with refrigerantB
system is low on refrigerantC
discharge valves are leaking excessivelyD
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单选题One cause of high head pressure occurring in a refrigeration system can be （）.A
insufficient cooling water flow to the condenserB
a low refrigerant charge in the systemC
the liquid valve is open too muchD
high evaporator superheat
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单选题The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.A
sub-cooled liquidB
high temperature liquidC
oil saturated liquidD
superheated vapor
考题
单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
protect the compressor from liquid flood backB
protect the compressor from low discharge pressureC
start and stop the compressor upon system demandD
start the compressor after a drop in the evaporator pressure
考题
单选题The sensing line for the low pressure cutout switch to a refrigeration system is located （）.A
in the chill boxB
before the receiverC
on the suction side of the compressorD
on the discharge side of the compressor
考题
单选题Sweating of the refrigeration system compressor crankcase is caused by （）.A
too much superheatB
insufficient superheatC
suction pressure too lowD
excessive refrigerant returning to the compressor
考题
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
purge air from the condenserD
clean the waterside of the condenser
考题
单选题Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）A
The condenser and the expansion valveB
The king valve and the solenoid valveC
The compressor and the expansion valveD
The condenser and the solenoid valve
考题
单选题The presence of bubbles in a refrigeration system liquid line may （）.A
promote refrigerant dehydrationB
be absorbed in the receiverC
cause low condensing pressureD
carry moisture and lead to corrosion
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