单项选择题
Air chambers are usually fitted to reciprocating pumps in order to （）.
A.increase discharge pressure
B.increase suction vacuum
C.develop pulsation flow
D.keep a steady rate of flow
点击查看答案&解析
相关考题
-
单项选择题
Some pumps use packing as sealing glandThe gland should be （）.
A.slack enough to allow slight leakage of fluid
B.slightly clocked
C.brought up tight so as not to allow any leakage
D.fitted with a relief valve -
单项选择题
Which of the following pumps is used where a relatively high pressure and small capacity are required?（）
A.Volute pump
B.Diffuser pump
C.Regenerative pump
D.All of the above -
单项选择题
The （） pump discharges a nearly constant amount of liquid regardless of pressure.
A.mixed-flow
B.axial-flow
C.centrifugal
D.displacement
