单项选择题
Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.
A.liquid
B.dry saturated gas
C.wet saturated gas
D.superheated vapor
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相关考题
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单项选择题
Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.
A.closed, and no leakage permitted across the shaft packing
B.closed, and only slight leakage permitted across the shaft packing
C.open, and no leakage permitted across the shaft packing
D.open, and only slight leakage permitted across the shaft packing -
单项选择题
Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.
A.freezing point
B.floc point
C.condensing temperature
D.compression temperature -
单项选择题
If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.
A.the circuit breaker
B.for leaks in the suction piping
C.relief valve is not properly seated
D.the suction strainer
