單項選擇題

Which of the devices listed is common to all types of pumps?（）

A.A power end and fluid end
B.A propeller and educator
C.A volute and impeller
D.A turbine and piston

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單項選擇題

A centrifugal pump may fail to deliver water when first started if the （）.

A.water seal pipe is plugged
B.pump is not primed
C.seal ring is improperly located
D.impeller is flooded

單項選擇題

Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）

A.Close radial clearance between impeller hub and casing
B.Low rotational speed of impeller
C.Removable end plate
D.Replaceable impeller and casing wearing rings

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Which of the devices listed is common to all types of pumps?（）

你可能感興趣的試題

A centrifugal pump may fail to deliver water when first started if the （）.

Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）