單項(xiàng)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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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

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

你可能感興趣的試題

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

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