单项选择题
A.worn gland sealing shaft B.worn wearing rings C.a bent shaft D.reversed pump coupling
Which of the devices listed is common to all types of p...
单项选择题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
A centrifugal pump may fail to deliver water when first...
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
Which features of a centrifugal pump reduce the need fo...
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
