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单选题
Which will cause the high pressure cutout to stop the compressor in a R-22 system?（）
A
Condenser leakage
B
A shortage of liquid refrigerant
C
Excessive frost on the evaporator
D
Not enough condenser cooling water
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单选题If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.A
increase the flow of the cooling water through the condenserB
adjust the high pressure cutout to maintain the desired pressureC
open the hot gas bypass temporarily to reduce capacityD
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单选题When adding oil to a refrigeration system, precautions must be taken to ensure that （）.A
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单选题If a refrigeration compressor is short cycling on high head pressure, you should （）.A
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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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单选题If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.A
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单选题Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）A
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单选题If the refrigeration compressor crankcase is sweating, the cause may be due to （）.A
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单选题If the head pressure is too high,（）A
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the relief valve should open and let excess refrigerant go to receiverC
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考题
单选题Which of the following would not cause high suction pressure?（）A
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考题
单选题The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）A
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单选题Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? （） (1) faulty condensing (2) too few refrigerant (3) high discharge pressureA
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单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
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