单项选择题
Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A.Loss of suction
B.Increased clearances
C.Decreased clearance
D.Decreased slippage
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The dew point of air is reached when the wet bulb temperature is （）.
A.Twice the dry bulb temperature
B.10℃ above the dry bulb temperature
C.5℃ above the dry bulb temperature
D.Equal to the dry bulb temperature -
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Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）
A.Production of high salinity distillate
B.Seawater feed temperature below 165℃
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Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）
A.Latent heat of vaporization
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C.Superheat
D.All of the above
