單項選擇題

A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.

A.have a greater head capacity
B.operate with increased impeller efficiency
C.discharge through the suction side of the pump casing
D.require more power to run the shaft

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單項選擇題

Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.

A.hydraulic fluid contamination
B.excessive fluid friction
C.turbulent fluid flow
D.fluid pressure surges

單項選擇題

Air compressor receivers should be “blown down” at least （）.

A.yearly
B.quarterly
C.monthly
D.daily

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