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

点击查看答案&解析

上一题目录下一题

相关考题

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

单项选择题

The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.

A.fusion
B.vaporization
C.sublimation
D.condensation