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单选题
Moisture is removed from a refrigeration system by（）.
A
bleeding refrigerant from the condenser
B
opening a drain petcock on the oil separator
C
condensing the water in the heat exchanger
D
using a dehydrator cartridge
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考题
单选题Low compressor head pressure in a refrigeration system can be caused by（）.A
insufficient condenser cooling waterB
excessive condenser cooling waterC
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考题
单选题A refrigeration system contaminated with moisture can be affected by （）.A
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考题
单选题The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）A
latent heat of expansionB
sensible heat of condensationC
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考题
单选题The function of （） in a refrigeration plant using Freon is to move moisture from all refrigeration system.A
filterB
filter drierC
heat exchangerD
air cooler
考题
单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）A
Latent heat of vaporizationB
Heat of compressionC
SuperheatD
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考题
单选题In an air conditioning system, moisture is removed from the air by（）A
filersB
separatorsC
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单选题Air or noncondensable gas is removed from a refrigeration system by a （）A
separating chamberB
system of bafflesC
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单选题A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.A
the system is fully chargedB
there is air leaking in from the condenserC
ice crystals are forming in the refrigerantD
the system contains less than a full charge of refrigerant
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
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考题
单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
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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
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单选题Moisture in a refrigeration system can cause （）.A
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corrosion of system pipingC
improper temperature regulationD
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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
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考题
单选题A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）A
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recover water purged from the systemC
separate foul gases from the receiverD
purge non-condensable gases without losing refrigerant
考题
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考题
单选题The low pressure side of a refrigeration system is considered to exist from the （）.A
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考题
单选题If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, （）.A
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oil will not leave the crankcaseC
compressor valves will be damagedD
oil may congeal in the evaporator
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单选题The wooden plug inserted in the vent of a damaged tank of a ship should be removed in case it is decided to（）.A
pump from the damaged tankB
fight a fireC
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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
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