单项选择题

One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the （）.

A.motor overload will open
B.relief valve will open
C.pump will overheat
D.motor will overheat

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单项选择题

Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）

A.The liquid receiver functions to collect and remove non-condensable gases
B.A thermostatic expansion valve is used to control refrigerated space temperature
C.Refrigerant temperature in an evaporator is directly related to refrigerant pressure
D.Dehydrators must be used continuously in a refrigeration system

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The basic function of the centrifugal pump impeller is to （）.

A.directly increase the pressure of the liquid being pumped
B.directly increase the velocity of the liquid being pumped
C.convert the potential energy of the liquid to kinetic energy
D.separate air from the liquid being pumped

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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