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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 switc

题目

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 generation

B.why the speed of the engine fluctuates

C.how the governor works

D.how the fuel pumps work

The 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.①

B.①②

C.②③

D.①②③

Which 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 boar

E.

When the speed of the engine decreases due to increased load, which of the following will NOT happen?A.The flyweights move towards their center

B.The pilot valve plunger moves towards its normal position

C.The power piston moves downwards until it returns to its normal position

D.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！

相似考题

1.This is the latest prototype.“prototype” here means a standard or typical example. ()此题为判断题(对，错)。

2.The typical example of functional communication activities is ination gap activities.()此题为判断题(对，错)。

3.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

4.The typical example of functional communication activities is role play. ()此题为判断题(对，错)。

更多“材料:A typical example of a hydraulic governor is the Woodward. This has adjustable droop ”相关问题

  • 第1题：

    When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .

    A.pick up more of any increase in load

    B.pick up less of any increase in load

    C.share an equal amount of any increase in load

    D.drop an equal amount of any decrease in load


    正确答案：A

  • 第2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3题：

    单选题
    When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.
    A

    ram relief valves bypass oil to stop rudder movement

    B

    six-way valve shifts to the neutral flow position

    C

    steering pump electric motor is de - energized by the transfer switch

    D

    follow-up gear takes the hydraulic pump off stroke


    正确答案： D
    解析： 暂无解析

  • 第4题：

    单选题
    Purging air from a hydraulic system is necessary when（）
    A

    adding small amounts of oil to the system

    B

    the system has been overheated

    C

    the system has been drained and then filled with new oil

    D

    the system has been idle for a long period of time


    正确答案： C
    解析： 暂无解析

  • 第5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6题：

    单选题
    What is the best way of stopping an over-speeding diesel engine?（）
    A

    Disconnect the battery cables from the starting motor

    B

    Drain the hydraulic fluid from the governor sump

    C

    Block the flow of cooling air to the radiator

    D

    Secure the fuel supply and block the air intake


    正确答案： D
    解析： 暂无解析

  • 第7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8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9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10题：

    单选题
    The load sharing characteristics of two diesel generator operating in parallel are mostly dependent on their governor （）.
    A

    load limit settings

    B

    idle speed settings

    C

    speed limit settings

    D

    speed droop settings


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided.This could be caused by（）
    A

    an incorrect diesel generator governor speed droop adjustment

    B

    a faulty reverse power relay within the main circuit breaker assembly

    C

    unsynchronized isochronous load distribution adjustments

    D

    a different speed setting on each unit


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine （）
    A

    speed will drop drastically with any increase in load

    B

    will stop due to zero fuel supply

    C

    will stall upon application of load

    D

    speed will remain fairly constant despite load changes


    正确答案： D
    解析： 暂无解析

  • 第13题：

    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 the

    A.pilot valve opening

    B.compensating needle valve

    C.compensating spring tension

    D.accumulator spring tension


    正确答案：B

  • 第14题：

    The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.

    A.load limit settings

    B.idle speed settings

    C.speed limit settings

    D.speed droop settings


    正确答案：D

  • 第15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16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17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18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19题：

    单选题
    In a simple mechanical governor, the （）
    A

    centrifugal force rotates the ball-head

    B

    flyweight centrifugal force is balanced by spring force

    C

    flyweight centrifugal force is balanced by hydraulic pressure

    D

    speeder spring alone actuates the fuel control rod


    正确答案： D
    解析： 暂无解析

  • 第20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21题：

    单选题
    When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.
    A

    pick up more of any increase in load

    B

    pick up less of any increase in load

    C

    share an equal amount of any increase in load

    D

    drop an equal amount of any decrease in load


    正确答案： A
    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
    The ability of the governor to prevent fluctuations in engine speed is termed （）.
    A

    sensitivity

    B

    stability

    C

    promptness

    D

    speed droop


    正确答案： C
    解析： 暂无解析

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