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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相关考题
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单项选择题
The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.
A.electric motor
B.volute
C.impeller
D.diffusion nozzle -
单项选择题
In a refrigeration system, foaming of the crankcase oil may cause the （）.
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
Excessive scale formation in a distilling plant may result from （）.
A.poor distillate quality
B.reduced evaporator capacity
C.low brine concentration
D.improper vacuum regulation
