单选题An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned ().Aradially from the shaftBparallel to each other and to the shaftCparallel to each other but at a right angle to the shaftDat an angle to each other and to the shaft

单选题
An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned ().
A

radially from the shaft

B

parallel to each other and to the shaft

C

parallel to each other but at a right angle to the shaft

D

at an angle to each other and to the shaft


参考解析

解析: 暂无解析

相关考题:

The delivery rate of an axial piston hydraulic pump is controlled by varying the position of theA.tilting boxB.slide blockC.pintleD.reaction ring

The usual number of single-acting pistons used in a variable stroke axial-piston pump isA.3 or 5B.5 or 7C.7 or 9D.9 or 11

材料:A typical example of a hydraulic governor is the Woodward. This has adjustable droop for parallel operation and it is fitted with a speed-adjusting control . If required it can be fitted with a synchronizing motor to provide remote control from a switchboard.A gear pump driven from the engine supplies oil under pressure to accumulator pistons under which is a by-pass to regulate maximum pressure. One branch supplies oil which acts on top of the power piston, the pressure always tending to turn the terminal shaft to shut off fuel, while the other branch supplies oil to the pilot valve which is operated by the linkage from the fly weights above.Should the speed of the engine decrease due to increased load the flyweights will move towards their center of rotation and lower the position of the pilot valve plunger, admitting oil pressure from the bottom of the power piston. Since, however, the area on the bottom is much greater than the top the net resultant force causes the piston to move upwards. This operates the power lever turning the terminal shaft which varies the cut-off point in the fuel pump through linkage, but as the power piston moves up, the actuating compensating piston moves down.Oil under this piston is now forced through the needle valve to the receiving compensating piston, raising the outer end of the floating lever and the pilot valve plunger until it has returned to its normal position. This stops further movement of the terminal shaft so that the fuel control is now set in a position corresponding to the increased fuel required to run the engine at normal speed under the increased load.问题:This passage is mainly about ___.A.what type of governor should be provided when the engine is used for electric power generationB.why the speed of the engine fluctuatesC.how the governor worksD.how the fuel pumps workThe oil from the gear pump will ___. ① be supplied to the accumulator ② act on the power piston ③ be supplied to the pilot valveA.①B.①②C.②③D.①②③Which of the following is true about the Woodward discussed?A.It is a kind of mechanical governor.B.It can not be used for parallel operation.C.It has speed droop.D.It may only be manually controlled from a switch boarE.When the speed of the engine decreases due to increased load, which of the following will NOT happen?A.The flyweights move towards their centerB.The pilot valve plunger moves towards its normal positionC.The power piston moves downwards until it returns to its normal positionD.The terminal shaft moves to a new position请帮忙给出每个问题的正确答案和分析,谢谢!

单选题The function of a centrifugal pump double volute casing is to ().Areduce radial thrust to the impellerBdouble the liquid velocity through the pump when compared to a single voluteCreduce hydraulic end thrustDprovide the effect of multi-staging

单选题A variable displacement system of hydraulic drives consists of ().Aa variable displacement axial piston pumpBa constant displacement axial piston pumpCa reciprocating piston pumpDa centrifugal pump

单选题The diameter of a piston is usually less at the crown than at the skirt, in order to ().Afacilitate the installation of piston ringsBallow for the expansion of the piston during operationCprevent crankcase vapors from entering the combustion chamberDreduce wearing of the upper cylinder liner

单选题One of the main functions of wearing rings, as used in a centrifugal pump, is to ().Amaintain radial alignment between the pump impeller and casingBabsorb all impeller shaft end thrustCprevent water leakage to the atmosphereDprevent wear of the pump casing and/or impeller

单选题If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be ().Acontaminated fluidBpitted thrust ringsCworn pintle bearingsDobstructed suctions passage

单选题The function of the piston compression rings used in a diesel engine is to ()Aseal the space between the piston and linerBtransmit heat from the piston to the cylinder linerCreduce the amount of combustion gas blow-byDall of the above

单选题The main purpose of the piston oil scraper rings is to ().Aseal the space between the piston and the linerBreduce the amount of lube oil burned in the combustion chamberCtransmit heat from the piston to the cylinder linerDdamp out fluctuations of the piston side thrust

单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a ().Aloss of suction in the circulating pumpBleak in the primary cooling systemCbroken raw water pump shaftDburned or cracked piston in one cylinder

单选题When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?()AThe pistons reciprocateBThe ‘B’ end cylinder barrel rotatesCThere is no fluid flowDPower is transmitted hydraulically

单选题Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?()AClose radial clearance between impeller hub and casingBLow rotational speed of impellerCRemovable end plateDReplaceable impeller and casing wearing rings

单选题The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the ().Aslide blockBtilting boxCpintleDreaction ring

单选题Low compression pressure in a diesel engine may be the result of ()Ainsufficient fuel supply due to fuel pump valves sticking or leakingBexcessive mechanical clearance between the piston crown and cylinder headCexcessively worn fuel pump plungerDexcessive exhaust back pressure

单选题Which of the following statements is/are true regarding hydraulic pumps in general? ()AVariable volumes can be obtained with gear pumps only by variation of the pump drive speedBA radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaftCThe amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plateDAll of the above

单选题The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the ().Asliding blockBpintleCreaction ringDtilting box or swash plate

单选题With reference to an axial piston pump, which one of the following statements is true?()AThe cylindrical barrel is coupled to the motorBThe cylindrical barrel has an odd number of boresCThe bores end in socketsDThe sockets fit in the swash plate

单选题An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will().Acause loss of hydraulic oil from the systemBresult in extreme damage to the pumpCcause damage to the pump ff not continually drained from the pump casingDresult in the system high side pressure to substantially drop off

单选题An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned ().Aradially from the shaftBparallel to each other and to the shaftCparallel to each other but at a right angle to the shaftDat an angle to each other and to the shaft

单选题In a radial piston pump, reversal and control of fluid flow are accomplished by moving the ().Acentral valveBradial plungerCfloating ringDcylinder body

单选题With reference to a radial piston pump, which one of the following statements is false?()ASurrounding the fixed shaft is a hollow shaftBThis hollow shaft carries radial boresCEach bore is fitted with a well-lapped plungerDThere are always even numbers of bores

单选题The function of diesel engine piston compression rings is to ().Aprevent piston side thrustBprevent engine friction lossesCtransmit heat from the piston to the cylinder linerDremove oil from the cylinder combustion space

单选题Piston compression rings used in a diesel engine function to ()Atransfer heat from the cylinder to the pistonBscrape oil from the sides of the pistonCseal the combustion space from the crankcasesDprevent any piston contact with the cylinder liner

单选题A diesel engine piston crown can crack from ()Aexcessive piston to liner clearanceBexcessive dirt beneath the piston crown that reduces heat transferCfaulty nozzle sprayDall of the above

单选题Which harmful consequence may be the result of lube oil sludge accumulation? ()AClogged oil pump suction screensBIncreased oil operating temperaturesCSticking piston ringsDAll of the above

单选题A gudgeon pin in a trunk piston may be free to float and rotate, with () to limit axial movement.Asplit pinsBcrankpinsCdipsticksDcirclips

单选题The usual number of single-acting pistons used in a variable stroke axial-piston pump is ().A3 or 5B5 or 7C7 or 9D9 or 11