單項(xiàng)選擇題

If air at 95℃ dry bulb temperature and 50% relative humidity is conditioned to 75℃ dry bulb temperature and 50% relative humidity, it is an example of （）.

A.cooling only
B.cooling and humidifying
C.cooling and dehumidifying
D.adiabatic cooling

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Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）

A.Sea water is heated to boiling temperature while under a vacuum
B.Sea water is passed over heated plates in a thin film
C.Heated sea water is injected into a vacuum chamber
D.Sea water is forced through a heated eductor

單項(xiàng)選擇題

Which of the listed conditions can lead to cavitation氣穴in a centrifugal pump?（）

A.Vapor pockets formed in the suction flow stream
B.Rough easing volute surfaces
C.Worn wearing rings
D.Heavy fluid in the flow stream