单选题Before being shut down, a diesel engine should idle a few minutes in orderto （）A prevent governor surging at shutdownB make sure the fuel nozzles are flushed cleanC prevent pressure buildup in the fuel linesD prevent damage from localized overheating

题目
单选题
Before being shut down, a diesel engine should idle a few minutes in orderto （）
A

prevent governor surging at shutdown

B

make sure the fuel nozzles are flushed clean

C

prevent pressure buildup in the fuel lines

D

prevent damage from localized overheating

相似考题

1.You should make sure that your password is long enough to prevent it ______ being easily hacked.A.inB.fromC.out

2.A thrust bearing is used with a propulsion diesel engine to ____.A.control axial movement of the crankshaftB.transmit engine thrust to the propeller shaftC.absorb vibrations in the propeller shaftingD.prevent propeller thrust from being transmitted to the hull

3.第一组Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers&39; recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.Modern uniflow scavenged engines have______.A.a single injector mounted in the center of the cylinder headB.several injectors mounted around the external boundary of the cylinder headC.a single injector mounted at the external boundary of the cylinder headD.several injectors mounted in the center of the cylinder head

4.The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.A.determine the need for filter cleaningB.measure any change in oil viscosityC.prevent damage to the filterD.determine the need for batch filtration

更多“单选题Before being shut down, a diesel engine should idle a few minutes in orderto （）A prevent governor surging at shutdownB make sure the fuel nozzles are flushed cleanC prevent pressure buildup in the fuel linesD prevent damage from localized overheating”相关问题

  • 第1题：

    _______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.

    A.Excessive fuel nozzle holder cooling

    B.Sediment in the fuel supply

    C.Distortion of the fuel spray pattern

    D.Improper atomization of the fuel


    正确答案：B

  • 第2题：

    A safe fuel system must ______.

    A.prevent engine overheating

    B.have proper air/gasoline fuel mixture ratio

    C.be liquid- and vapor-tight

    D.supply sufficient air to the intake manifold


    正确答案：C

  • 第3题：

    单选题
    Care and cleanliness are required when installing diesel fuel filters （）.
    A

    to prevent the fuel system from becoming air-hound

    B

    to prevent the fuel system becoming clogged with dirty particles

    C

    both of the above

    D

    to prevent the lubricating oil from leaking out of the filter element


    正确答案： B
    解析： 暂无解析

  • 第4题：

    单选题
    Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
    A

    To prevent internal damage form local overheating

    B

    To ensure the fuel nozzles are flushed clean

    C

    To clear the smoke stack

    D

    To let the waste heat boiler reduce its rate of steam generation


    正确答案： D
    解析： 暂无解析

  • 第5题：

    单选题
    While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）
    A

    reduce the fuel feeding of main engine of inner propeller

    B

    reduce the fuel feeding of main engine of outer propeller

    C

    firstly reduce the fuel of main engine of inner propeller, then reduce the fuel feeding of engine of outer propeller

    D

    reduce fuel feeding of two engines at the same time


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    Why is it necessary to warn engine room personnel before activating the fixed CO2 system?（）
    A

    To make them aware there is a fire

    B

    To let them know they should leave the engine room

    C

    To prevent possible injury from frostbite

    D

    To make them aware that ventilation will automatically stop


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    After fuel tanks have been topped off, which of the listed procedures should be followed next?（）
    A

    The pressure-vacuum relief valve should be reset

    B

    The tanks should be made seaworthy to prevent contamination

    C

    The tanks should be sounded to make sure the levels are not rising

    D

    The tanks should be marked with a bull stamp on the manifold filling valve


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Fuel is admitted to a diesel engine cylinder through the （）.
    A

    intake valves

    B

    carburetor

    C

    exhaust ports

    D

    injector nozzles


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    When fueling has been completed（）.
    A

    the fuel tank fill pipe should be left open to allow vapors to vent from the tank

    B

    the engine should be started immediately to prevent vapor lock in the fuel line

    C

    all hatches should be opened and all compartments should be ventilated

    D

    open the fuel line and drain a small amount of gasoline into the bilge to clear the line of sediment


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    Before being shut down, a diesel engine should idle a few minutes in orderto （）
    A

    prevent governor surging at shutdown

    B

    make sure the fuel nozzles are flushed clean

    C

    prevent pressure buildup in the fuel lines

    D

    prevent damage from localized overheating


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）
    A

    employing fuel oil as a cooling medium

    B

    preventing hard carbon deposit on nozzle tips

    C

    avoiding fuel oil temperature exceeding builder’s specification

    D

    ensuring good metallic contact between nozzles and cylinder heads


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    To prevent vibration damage to the fuel supply line of a diesel engine, you may use （）.
    A

    a short length of heavy duty clear plastic tubing

    B

    a length of approved flexible nonmetallic hose

    C

    welded flange connections for all joints

    D

    aluminum piping with expansion loops


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Why is it necessary to warn engine room personnel before activating the fixed CO2 system?

    A.To make them aware there is a fire

    B.To let them know they should leave the engine room

    C.To prevent possible injury from frostbite

    D.To make them aware that ventilation will automatically stop


    正确答案：B

  • 第14题：

    单选题
    Water in the fuel can prevent the engine from starting, prevent it from developing full power, or （）
    A

    run at an irregular speed

    B

    create high lube oil temperature

    C

    cause the engine to over-speed

    D

    cause blue smoke in the exhaust


    正确答案： A
    解析： 暂无解析

  • 第15题：

    单选题
    Heat damage to fuel injection nozzles can be prevented by avoiding （）
    A

    excessive fuel oil temperature

    B

    long periods of engine overload

    C

    metallic contact between nozzles and cylinder heads

    D

    hard carbon deposit and varnish on the nozzles


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    Before starting a diesel engine, you should always（）
    A

    check the pyrometer readings

    B

    check the crankcase oil level

    C

    check the fuel oil strainers

    D

    clean the fuel system


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    If a tow-stroke/diesel engine is over-speeding due to leakage of lube oil into the cylinders, what should you do to stop the engine?（）
    A

    Move the fuel control mechanism to the no fuel position

    B

    Block the fuel supply by closing the master fuel valve

    C

    Shut off the fuel supply and block the flow of intake air

    D

    Relieve all pressure in the fuel system


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    The lubrication to the cylinders affected by the fire must be （）to prevent seizure and all scavenge drains must be （）to prevent the discharge of sparks and burning oil from the drains into the engine room.
    A

    decreased；opened

    B

    decreased；shut

    C

    increased；opened

    D

    increased；shut


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）
    A

    inspection covers should not be opened until the engine has cooled

    B

    ventilation system should be continued in operation for one hour for cooling

    C

    scavenge pump should be immediately secured to prevent loss of lube oil

    D

    explosion covers should be opened slightly to provide extra ventilation


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.
    A

    water in the fuel oil supply

    B

    excessive fuel nozzle holder cooling

    C

    a distorted fuel spray pattern

    D

    leakage past the plunger into the oil drain


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.
    A

    excessive fuel nozzle holder cooling

    B

    sediment in the fuel supply

    C

    distortion of the fuel spray pattern

    D

    improper atomization of the fuel


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    When ship navigating in rough sea, the first measure taken by the chief engineer to prevent the overload should be（）
    A

    cleaning fuel oil, lubricating oil and seawater filter

    B

    reducing fuel feeding of the main engine appropriately or reducing the pitch angle of propeller

    C

    using low sea chest

    D

    closing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    Whether a ship is sailing before the wind or sailing in the rough sea, we must reduce the fuel injection of the main engine.For the former one, it aims to prevent the main engine being（）, while for the later one, it aims to prevent the main engine being（）.
    A

    overspeed；overload

    B

    overload；overspeed

    C

    over torque；overspeed

    D

    low mechanical efficiency；overload


    正确答案： B
    解析： 暂无解析

  • 第24题：

    单选题
    Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to （）
    A

    burn excessive amounts of lube oil

    B

    overheat without smoking

    C

    operate with reduce power or stop

    D

    run away without load


    正确答案： A
    解析： 暂无解析

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