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单选题
The sensing line for the low pressure cutout switch to a refrigeration system is located （）.
A
in the chill box
B
before the receiver
C
on the suction side of the compressor
D
on the discharge side of the compressor
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单选题If the compressor runs continually, the cause might be the（）A
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low-pressure switch is jammed shutC
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scale trap is clogged
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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The direction of the surface wind is（）.A
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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
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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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clogged scale trapC
stuck high-pressure switchD
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单选题The purpose of the low pressure cut-out switch is to （）.A
maintain liquid refrigerant at the suction of the compressorB
maintain a preset suction pressure to the compressorC
start and stop the compressor at preset operating pressuresD
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单选题Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）A
Thermal expansion valve frozen openB
Suction gas heat exchanger bypassedC
Condenser clogged or fouledD
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