单项选择题

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

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单项选择题

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

单项选择题

When securing a flash-type evaporator for an extended period of time, you should （）.

A.fill the unit with saltwater
B.fill the unit with de-scaling compound
C.completely drain the unit
D.tightly seal the unit to exclude air

单项选择题

A distinguishing feature of an educator, when compared to other pumps, is the （）.

A.dischargeendbeingsmallerthanthesuctionend
B.smallsizeofimpeller
C.lackofmovingparts
D.easeatwhichthewearingringsmaybechanged