单选题In （） pump a closed discharge valve will not cause excessive pressure to build up.AgearBvaneCscrewDcentrifugal
单选题
In （） pump a closed discharge valve will not cause excessive pressure to build up.
A
gear
B
vane
C
screw
D
centrifugal
参考解析
解析：
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相关考题：
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 speedB.excessive suction headC.worn wearing ringsD.gross pump misalignment
The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.A.butterfly valveB.spectacle valveC.check valveD.globe valve
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 reachedB.Run the pump at high speed with the discharge valves closedC.Run the turbine at slow speed with the pump disconnectedD.Shut the discharge valve and run the pump at slow speed
单选题If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.Amotor overload would openBrelief valve would openCpump would eventually overheatDmotor would overheat
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单选题Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build upA（1），（2）B（2），（3）C（1），（2），（3）D（2）only
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单选题In （） pumps a closed discharge valve will cause bursting discharge pressure.AcentrifugalBplungerCinjectorDwater
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单选题The usual symptoms of cavitation in a centrifugal pump is （）.Anoise and vibrationBan increase in discharge pressureCan increase in suction pressureDlifting of the relief valve
单选题If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.Aexcessive pump speedBexcessive suction headCworn wearing ringsDgross pump misalignment
单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）AThey should always be started with the discharge valve closedBThey should always be started with the discharge valve openedCA priming pump is always required to flood the impeller suctionDThey should always be started with the sealing line valves closed
单选题A relief valve for a cargo pump is generally installed（）.Aafter the discharge valveBbetween the pump and discharge valveCafter the suction valveDbetween the pump and suction valve
单选题Operating a rotary pump at speeds in excess of design requirements could cause（）.Adecreased clearances between rotating partsBdecreased slippage to the suction side of the pumpCair binding in the discharge portsDerosion and excessive wear
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单选题A centrifugal pump attempting to develop flow against a closed discharge valve has a/an （）.Acapacity of 0%Befficiency of 100%Cinternal slippage of 0%Dshut off horsepower rating of 100%
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单选题If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）AThe wearing rings are excessively wornBThe suction strainer is cloggedCThe discharge valve is cloggedDThe shaft is worn
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单选题If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?（）ACentrifugalBGearCPropellerDTurbine
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