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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单项选择题

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

单项选择题

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
B.Heat of compression
C.Superheat
D.All of the above