closed
opened fully
cracked open
partly open
第1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2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：
closed
opened fully
cracked open
partly open
第5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6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7题：
motor overload would open
relief valve would open
pump would eventually overheat
motor would overheat
第8题：
The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.
A.butterfly valve
B.spectacle valve
C.check valve
D.globe valve
第9题：
They are self-priming
Decreasing the speed of rotation will decrease the discharge pressure
Opening the discharge valve wider will increase the discharge pressure
All of the above
第10题：
（1），（2）
（2），（3）
（1），（2），（3）
（2）only