单项选择题

An increase in rotor clearances in a rotary pump will （）.

A.increase discharge pressure
B.decrease pump capacity
C.decrease pump cavitation
D.decrease reaction ring clearance

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单项选择题

Sweating of the refrigeration system compressor crankcase is caused by （）.

A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor

单项选择题

Which bearing will carry the load on two small points diametrically opposite to each other?（）

A.Needle
B.Tapered roller
C.Roller
D.Ball

单项选择题

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