海船船员考试
单选题If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）A insufficient speedB cavitationC excess discharge pressureD excessive net positive suction head B
题目
insufficient speed
cavitation
excess discharge pressure
excessive net positive suction head B
相似问题和答案
第1题：
All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．
A.Set the relief valve
B.Check the lubrication system
C.Vent the pump casing
D.Open the pump suction and discharge valves
第2题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
第3题：
Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.
A.suction
B.exhaust
C.pressure
D.discharge
第4题：
cavitation
water hammer
fluid friction
steam knock
第5题：
insufficient speed
cavitation
excess discharge pressure
excessive net positive suction head B
第6题：
You start a centrifugal cargo pump to discharge cargo．The pump works for a while and then loses suction．This could be caused by ______．
A.The pump running backwards
B.Incomplete priming
C.The discharge head being too high
D.All of the above
第7题：
Oil is discharged from the impeller through the outlet
Gravity causes the oil to flow toward the discharge
The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
The discharge capacity varies directly with the speed of the impeller
第8题：
____________, they immediately left the house.
A、Being heard the noise
B、Hearing the noise
C、They heard the noise
D、They were hearing the noise
第9题：
a centrifugal fan
a direct expansion cooler
a hermetic compressor
a centrifugal pump
第10题：
one size larger than the pump discharge nozzle
the same size as the pump discharge nozzle
one size smaller than the pump discharge nozzle
installed with a short radius elbow at the pump