excessive water in the bilges
a clogged suction strainer
oil in the bilges
All of the above
第1题：
The pressure of a liquid leaving the pump can be referred to as the ______.
A.total head
B.discharge head
C.net positive suction head
D.suction head
第2题：
If you must pump bilges while a vessel is in port，you should pump only ______．
A.If discharge is led to a shore tank or barge
B.During the hours of darkness
C.On the outgoing tide
D.As much as is necessary
第3题：
Which of the following terms is used to identify the pressure of the liquid entering a pump?
A.Suction head
B.Pump head
C.Discharge head
D.Total head
第4题：
primarily to lubricate the shaft seals
due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
to initially unload the pump by having its head pressure equal to discharge pressure
in order to overcome the potential energy of water in the discharge line
第5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6题：
If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.
A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
第7题：
Which method should be used to warm up the pump turbines prior to discharge ________．
A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reached
B.Run the pump at high speed with the discharge valves closed
C.Run the turbine at slow speed with the pump disconnected
D.Shut the discharge valve and run the pump at slow speed
第8题：
Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? l.Its discharge is continuous; ll.It has no internal valves: lll.Upon accidental closing of discharge valve, excessive pressure will not build up()
A.l, ll
B.ll, lll
C.l ,ll.III
D.llonly
第9题：
gear
vane
screw
centrifugal
第10题：
excessive internal leakage in the pump
low discharge pressure and fluid flow
excessive fluid level in the hydraulic reservoir
operation of the pump at 100% efficiency