單項(xiàng)選擇題

The function of a centrifugal pump double volute casing is to （）.

A.reduce radial thrust to the impeller
B.double the liquid velocity through the pump when compared to a single volute
C.reduce hydraulic end thrust
D.provide the effect of multi-staging

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單項(xiàng)選擇題

Dirt should not be allowed to contaminate a grease lubricant because the （）.

A.dirt will cause corrosion of bearing
B.bearings will leak oil excessively
C.dirt is very abrasive when mixed with grease
D.grease will become inflammable

單項(xiàng)選擇題

The presence of bubbles in a refrigeration system liquid line may （）.

A.promote refrigerant dehydration
B.be absorbed in the receiver
C.cause low condensing pressure
D.carry moisture and lead to corrosion

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The function of a centrifugal pump double volute casing is to （）.

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Dirt should not be allowed to contaminate a grease lubricant because the （）.

The presence of bubbles in a refrigeration system liquid line may （）.