单选题Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）ALoss of suctionBIncreased clearancesCDecreased clearanceDDecreased slippage
单选题
Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A
Loss of suction
B
Increased clearances
C
Decreased clearance
D
Decreased slippage
参考解析
解析：
暂无解析
相关考题：
Prices are _________ at an ever－increasing speed; people are complaining loudly. A.goingB.advancingC.progressingD.moving
Compared to a constant pitch propeller, a controllable pitch propellerA.more efficiently uses available engine powerB.operates at a lower efficiency at a fixed speedC.produces the same torque at lower engine powerD.develops its rated power at a lower speed
The amount of fluid delivered by a positive displacement pump can be regulated by _____.A.throttling the pressure lineB.changing the speed of the driving rotorC.either A or BD.None of the above is tree
An over-speed safety device is usually fitted to a generator engine for ___ in the event of over-speed.A.stabilizing the ship speedB.increasing the fuel pump settingC.braking the crankshaftD.cutting power off the engine
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
Which pump must always be primed ________．A.Centrifugal pumpB.Reciprocating pumpC.Rotary pumpD.All of the above
单选题Load control on a diesel engine is accomplished by （）.Aregulating the speed of the turbochargerBrotating the fuel injector pump plungerCregulating the speed of the fuel oil transfer pumpDchanging engine timing
单选题Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）AOil is discharged from the impeller through the outletBGravity causes the oil to flow toward the dischargeCThe self-priming feature of the centrifugal pump enables it to draw its own suction as it startsDThe discharge capacity varies directly with the speed of the impeller
单选题If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.Aa little lowerBa little higherCtoo lowDexactly the same
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）Athe temperature and flow quantity of the exhaust gas from M.EBthe quantity of steam demandedCthe rotary speed and the cooling water temperature of main engineDefficiency of M.E turbocharger
问答题An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was its average speed for the two journeys?
单选题A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.Aslow-speed dieselBmedium-speed dieselChigh-speed dieselDconstant-speed diesel
单选题If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）Atoo lowBa little lowerCa little higherDexactly the same
单选题Which method should be used to warm up the pump turbines prior to discharge（）.ALock the turbine rotor and slowly bleed in steam until operating temperature is reachedBRun the pump at high speed with the discharge valves closedCRun the turbine at slow speed with the pump disconnectedDShut the discharge valve and run the pump at slow speed
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 （）.Adiameter of the discharge piping, with all other factors remaining the sameBdiameter of the suction piping, with all other factors remaining the sameCwidth of the impeller onlyDdiameter of the impeller
单选题Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）Adiameter of the discharge piping, with all other factors remaining the sameBdiameter of the suction piping, with all other factors remaining the sameCwidth of the impeller onlyDdiameter of the impeller
单选题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）ADuring operation at low speedBDuring operation at rated speed, but low power outputCDuring accelerationDAll of the above
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Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially （）.AincreaseBdecreaseCfluctuateDremain constant
单选题The amount of fluid delivered by a gear pump can be regulated by （）.Athrottling the pressure lineBchanging the speed of the rotorCeither A or BDNone of the above is true
单选题If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）Afuel pump should be removed and all connections blanked offBcylinder oil feed rate should be increased slightly above that used at normal sea speedCcylinder oil feed rate should be reducedDcylinder oil feed rate should be increased to the maximum flow capable of the metering pump
单选题Compared to a constant pitch propeller, a controllable pitch propeller（）.Amore efficiently uses available engine powerBoperates at a lower efficiency at a fixed speedCproduces the same torque at lower engine powerDdevelops its rated power at a lower speed
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.Aincreased pump speedBexcessive pump discharge pressureCtoo low of a tilting box angleDlow pump speed
单选题The amount of fluid delivered by a positive displacement pump can be regulated by （）.Athrottling the pressure lineBchanging the speed of the driving rotorCeither A or BDNone of the above is tree
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）Athe temperature and flow quantity of the exhaust gas from M/EBthe quantity of steam demandedCthe rotary speed and the cooling water temperature of main engineDefficiency of M/ turbocharger
单选题A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）Aone-half engine speedBthe same as engine speedCtwice engine speedDfour times engine speed