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单选题
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A
refrigerant overcharge
B
overfeeding by the expansion valve
C
a restricted suction strainer
D
due to short cycling of the compressor
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insufficient condenser cooling waterB
excessive condenser cooling waterC
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单选题Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）A
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考题
单选题Insufficient refrigerant in a refrigeration plant may result in （）.A
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单选题If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.A
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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
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单选题In the refrigeration system, a shortage of refrigerant is indicated by （）.A
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单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
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单选题If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.A
refrigerant overchargeB
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单选题Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.A
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refrigerant absorption by the lubricantC
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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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start the compressor after a drop in the evaporator pressure
考题
单选题An increase in the heat load to a refrigeration system will cause （）.A
the suction pressure to decreaseB
the suction temperature to increaseC
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考题
单选题The sensing line for the low pressure cutout switch to a refrigeration system is located （）.A
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insufficient superheatC
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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
operate at minimum efficiency
考题
单选题When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a （）.A
loose expansion valve control bulbB
low differential setting on the H-PcutoutC
blown fuse in the motor circuitD
faulty suction pressure regulator
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