單項選擇題

Refrigeration system compressor crankcase sweating is an indication of （）.

A.insufficient lube oil circulating through the system
B.excessive circulation of lube oil through the system
C.insufficient refrigerant in the system
D.an overworked compressor

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單項選擇題

Operating a rotary pump at speeds in excess of design requirements could cause（）.

A.decreased clearances between rotating parts
B.decreased slippage to the suction side of the pump
C.air binding in the discharge ports
D.erosion and excessive wear

單項選擇題

A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.

A.a shortage of refrigerant in the system
B.air in the system
C.an accumulation of liquid refrigerant in the crankcase
D.a shortage of oil in the crankcase

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Refrigeration system compressor crankcase sweating is an indication of （）.

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Operating a rotary pump at speeds in excess of design requirements could cause（）.

A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.