海船船员考试
单选题Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.A diameter of the discharge piping, with all other factors remaining the sameB di
题目
diameter of the discharge piping, with all other factors remaining the same
diameter of the suction piping, with all other factors remaining the same
width of the impeller only
diameter of the impeller
相似问题和答案
第1题：
An over-speed safety device is usually fitted to a generator engine for ___ in the event of over-speed.
A.stabilizing the ship speed
B.increasing the fuel pump setting
C.braking the crankshaft
D.cutting power off the engine
第2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：
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6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7题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
第8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9题：
a centrifugal fan
a direct expansion cooler
a hermetic compressor
a centrifugal pump
第10题：
Lock the turbine rotor and slowly bleed in steam until operating temperature is reached
Run the pump at high speed with the discharge valves closed
Run the turbine at slow speed with the pump disconnected
Shut the discharge valve and run the pump at slow speed