單項(xiàng)選擇題

The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.

A.sudden evaporation of wax crystals in the lubricant
B.sudden evaporation of entrapped air in the lubricant
C.release of refrigerant from the oil/refrigerant mixture
D.release of dissolved lubricant from the refrigerant

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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