单选题If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）A have a larger than normal dead bandB produce excessive speed response to a load changeC respond slowly to any change in engine loadD stabilize

题目
单选题
If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
A

have a larger than normal dead band

B

produce excessive speed response to a load change

C

respond slowly to any change in engine load

D

stabilize engine speed at the new governor setting

相似考题

1.If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .A.have a larger than normal dead bandB.produce excessive speed response to a load changeC.respond slowly to any change in engine loadD.stabilize engine speed at the new governor setting

2.On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the______.A.accumulator spring compressionB.balance pistonC.compensating(补偿) needle valveD.proportional piston

3.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！

4.A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust theA.pilot valve openingB.compensating needle valveC.compensating spring tensionD.accumulator spring tension

更多“If the compensating needle valve of a hydraulic governor is”相关问题

  • 第1题：

    The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by ______.

    A.dirt

    B.fuel oil

    C.governor cooling water

    D.fuel oil tar(焦油)


    正确答案：A

  • 第2题：

    单选题
    Air bubbles in a hydraulic governor can cause （）
    A

    sluggish response

    B

    speed droop variations

    C

    isochronous governing

    D

    sensitivity increase


    正确答案： A
    解析： 暂无解析

  • 第3题：

    单选题
    Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）
    A

    maximum power at a normal load

    B

    maximum power and load under normal conditions

    C

    half speed and normal temperature

    D

    normal operating temperature without a load


    正确答案： A
    解析： 暂无解析

  • 第4题：

    单选题
    The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）
    A

    compensate for low oil level

    B

    increase governor promptness

    C

    prevent governor hunting

    D

    limit engine load


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    （） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.
    A

    Motors

    B

    Check valves

    C

    Safety valves

    D

    Reducing valve


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）
    A

    rack position should be adjusted

    B

    compensating needle valve should be opened fully compensating

    C

    needle valve should be adjusted to stabilize operation

    D

    speed limiting device should be adjusted


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
    A

    ensure penetration and distribution of the fuel in the combustion chamber

    B

    ensure the needle valve is flushed clean during each injection

    C

    prevent combustion gas blowback into the open needle valve

    D

    prevent reflected pressure waves when the needle valve closes


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Diesel engine air start valve timing is controlled by（）
    A

    engine operating speed

    B

    an air manifold

    C

    a hydraulic distributor

    D

    individual cams and valve gear


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）
    A

    dirt

    B

    fuel oil

    C

    governor cooling water

    D

    fuel oil tars


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.
    A

    tape face

    B

    tapered face

    C

    surface

    D

    thinner face


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    When the heat load begins to increase, the needle valve of an expansion valve will（）
    A

    move in an opening direction

    B

    move in a closing direction

    C

    either open or close

    D

    not move at all


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.
    A

    react with insufficient speed droop

    B

    fail to react to small speed changes

    C

    have excessive sensitivity to small speed changes

    D

    remain in the neutral position


    正确答案： C
    解析： 暂无解析

  • 第13题：

    燃料调节阀（fuel governor valve）


    正确答案:阀门或其他任何用作最终燃料调节元件的装置， 用于控制进入燃气轮机的燃料量。

  • 第14题：

    单选题
    If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
    A

    have a larger than normal dead band

    B

    produce excessive speed response to a load change

    C

    respond slowly to any change in engine load

    D

    stabilize engine speed at the new governor setting


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
    A

    be jammed

    B

    be opened

    C

    be seated

    D

    be broken


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    A large change in ambient temperature, or using an oil of a viscosity different from the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the （）.
    A

    pilot valve opening

    B

    compensating needle valve

    C

    compensating spring tension

    D

    accumulator spring tension


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    What type of valve is used to direct the flow of hydraulic fluid?（）
    A

    Relief valve

    B

    Direction control valve

    C

    Stop valve

    D

    Pressure control valve


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    The most common contaminate of governor hydraulic fluid is （）.
    A

    moisture

    B

    dirt

    C

    acid

    D

    air


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should （）.
    A

    increase the governor oil pressure

    B

    adjust the speed droop setting

    C

    adjust the speeder spring travel

    D

    adjust the compensating needle valve


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    If a main propulsion diesel engine hunts excessively at idle speed, you should （）
    A

    adjusts the idle speed control

    B

    drain and flushes the governor and replace the oil

    C

    adjusts the compensating needle valve


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    （） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.
    A

    Bulbs

    B

    Bulks

    C

    Flyweights

    D

    Flywheels


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）
    A

    accumulator spring compressor

    B

    balance piston

    C

    compensating needle valve

    D

    proportional piston


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
    A

    the four-way control valve failing to shift

    B

    the bleeder valve sticking in the open position

    C

    cold hydraulic fluid

    D

    a clogged air vent falter on the oil reservoir


    正确答案： C
    解析： 暂无解析

  • 第24题：

    单选题
    A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in （）
    A

    pilot valve oil pressure

    B

    speeder spring force

    C

    compensation needle valve clearance

    D

    centrifugal force on the flyweights


    正确答案： A
    解析： 暂无解析

相关内容