单项选择题

Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.

A.overheated compressor bearings
B.excess lube oil viscosity
C.carbon deposits on the compressor piston rings
D.wax crystals forming in the lubricant

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单项选择题

A.electric motor
B.volute
C.impeller
D.diffusion nozzle

单项选择题

A.expansion valve to overfeed
B.compressor to knock
C.water regulating valve to fail
D.crankcase drains to plug

单项选择题

A.poor distillate quality
B.reduced evaporator capacity
C.low brine concentration
D.improper vacuum regulation