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

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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

单项选择题

Foaming of the oil in a refrigeration compressor crankcase is caused by （）.

A.refrigerant boiling out of solution from the lube oil
B.liquid refrigerant flooding the compressor and system
C.lube oil viscosity being reduced by refrigerant dilution
D.compressor suction pressure suddenly increasing