你可能感興趣的試題

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

單項(xiàng)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