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 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（）.
A
cause loss of hydraulic oil from the system
B
result in extreme damage to the pump
C
cause damage to the pump ff not continually drained from the pump casing
D
result in the system high side pressure to substantially drop off
参考解析
解析：
暂无解析
相关考题：
(piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).A.brake horsepowerB.displacementC.cylinder volumeD.cylinder clearance
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
单选题In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）Aonce every crankshaft revolutionBonce every two crankshaft revolutionsConce every piston strokeDtwice every piston stroke
单选题Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.Aa exhaust valveBa piston skirtCa piston crownDan air suction valve
单选题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）Awide compression rings are usedBoil rings are located above the pistonCchromium plating is used on all piston ringsDoil rings are located near the bottom of the piston skirt
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（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.AThe medium speed 4-stroke trunk piston engineBThe low speed 2-stroke crosshead engineCThe medium speed 2-stroke crosshead engineDThe low speed 4-stroke trunk piston engine
单选题The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.AshutBclosingCopenedDclosed
单选题(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）Abrake horsepowerBdisplacementCcylinder volumeDcylinder clearance
单选题Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.Aaccelerates；deceleratesBaccelerates；acceleratesCdecelerates；deceleratesDdecelerates；accelerates
单选题The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.Athe pump cylinderBthe pump camCthe pump plungerDthe pump miler
单选题Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）Aincrease the liner area covered by the oil filmBmaintain an oil film on the lower liner where scuffing is prevalentCkeep excess oil away from intake and exhaust portsDhelp cushion piston skirt side thrust by providing a hydrodynamic oil wedge
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）AWhen the helm is at any angle other than amidshipsBWhen the six-way valve is openedCWhen the ram relief valves liftDWhen the redder angle is different from the position of the helm
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Under normal operating conditions, the rudder is hydraulically locked unless （）.Athe manual trick wheel is engaged for steeringBthe variable stroke pump is off strokeCa rudder order is given by the control systemDan electric power system failure occurs at the steering gear
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The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）Afuel delivery pressureBpump plunger diameterCplunger control rack positionDtotal pump stroke
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During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）AIntake strokeBCompression strokeCExhaust strokeDPumping stroke
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