单项选择题
Which of the listed conditions can lead to cavitation气穴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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相关考题
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单项选择题
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 -
单项选择题
The process of removing moisture from air is known as（）.
A.humidification
B.dehumidification
C.vaporization
D.evaporation -
单项选择题
The heat gained per pound of refrigerant in the evaporator is known as the（）.
A.latent heat of vaporization
B.sensible heat
C.refrigerating effect
D.specific heat of vaporization
