單項選擇題

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

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單項選擇題

A centrifugal bilge pump requires priming （）.

A.primarily to lubricate the shaft seals
B.due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
C.to initially unload the pump by having its head pressure equal to discharge pressure
D.in order to overcome the potential energy of water in the discharge line

單項選擇題

The process of removing moisture from air is known as（）.

A.humidification
B.dehumidification
C.vaporization
D.evaporation