网友您好, 请在下方输入框内输入要搜索的题目:
题目内容
(请给出正确答案)
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
参考答案
参考解析
解析:
暂无解析
更多 “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 systemB result in extreme damage to the pumpC cause damage to the pump ff not continually drained from the pump casingD result in the system high side pressure to substantially drop off” 相关考题
考题
(piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).A.brake horsepowerB.displacementC.cylinder volumeD.cylinder clearance
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
考题
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
考题
单选题In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs ()A
once every crankshaft revolutionB
once every two crankshaft revolutionsC
once every piston strokeD
twice every piston stroke
考题
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.A
a exhaust valveB
a piston skirtC
a piston crownD
an air suction valve
考题
单选题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, ()A
wide compression rings are usedB
oil rings are located above the pistonC
chromium plating is used on all piston ringsD
oil rings are located near the bottom of the piston skirt
考题
单选题A variable displacement system of hydraulic drives consists of ().A
a variable displacement axial piston pumpB
a constant displacement axial piston pumpC
a reciprocating piston pumpD
a centrifugal pump
考题
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.A
The medium speed 4-stroke trunk piston engineB
The low speed 2-stroke crosshead engineC
The medium speed 2-stroke crosshead engineD
The low speed 4-stroke trunk piston engine
考题
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 ().A
shutB
closingC
openedD
closed
考题
单选题(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine()A
brake horsepowerB
displacementC
cylinder volumeD
cylinder clearance
考题
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.A
accelerates;deceleratesB
accelerates;acceleratesC
decelerates;deceleratesD
decelerates;accelerates
考题
单选题During the suction stroke, the piston is moving ().A
inwardsB
outwardsC
downwardsD
upwards
考题
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.A
the pump cylinderB
the pump camC
the pump plungerD
the pump miler
考题
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 ()A
increase the liner area covered by the oil filmB
maintain an oil film on the lower liner where scuffing is prevalentC
keep excess oil away from intake and exhaust portsD
help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
考题
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?()A
When the helm is at any angle other than amidshipsB
When the six-way valve is openedC
When the ram relief valves liftD
When the redder angle is different from the position of the helm
考题
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?()A
The pistons reciprocateB
The ‘B’ end cylinder barrel rotatesC
There is no fluid flowD
Power is transmitted hydraulically
考题
单选题Under normal operating conditions, the rudder is hydraulically locked unless ().A
the manual trick wheel is engaged for steeringB
the variable stroke pump is off strokeC
a rudder order is given by the control systemD
an electric power system failure occurs at the steering gear
考题
单选题The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the ().A
slide blockB
tilting boxC
pintleD
reaction ring
考题
单选题The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the ()A
fuel delivery pressureB
pump plunger diameterC
plunger control rack positionD
total pump stroke
考题
单选题Which of the following statements is/are true regarding hydraulic pumps in general? ()A
Variable volumes can be obtained with gear pumps only by variation of the pump drive speedB
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaftC
The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plateD
All of the above
考题
单选题During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?()A
Intake strokeB
Compression strokeC
Exhaust strokeD
Pumping stroke
考题
单选题The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the ().A
sliding blockB
pintleC
reaction ringD
tilting box or swash plate
考题
单选题With reference to an axial piston pump, which one of the following statements is true?()A
The cylindrical barrel is coupled to the motorB
The cylindrical barrel has an odd number of boresC
The bores end in socketsD
The sockets fit in the swash plate
考题
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 systemB
result in extreme damage to the pumpC
cause damage to the pump ff not continually drained from the pump casingD
result in the system high side pressure to substantially drop off
考题
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 shaftB
parallel to each other and to the shaftC
parallel to each other but at a right angle to the shaftD
at an angle to each other and to the shaft
考题
单选题A gudgeon pin in a trunk piston may be free to float and rotate, with () to limit axial movement.A
split pinsB
crankpinsC
dipsticksD
circlips
考题
单选题The usual number of single-acting pistons used in a variable stroke axial-piston pump is ().A
3 or 5B
5 or 7C
7 or 9D
9 or 11
热门标签
最新试卷