单选题In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）A is coming upward；cylinder ring beltB is going downward；piston ring beltC is coming upward；piston ring beltD is going downward；cylin

题目
单选题
In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）
A

is coming upward；cylinder ring belt

B

is going downward；piston ring belt

C

is coming upward；piston ring belt

D

is going downward；cylinder ring belt

相似考题

1.If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.A.backfire through the air intakesB.develop less power under loadC.have high firing pressuresD.lift its cylinder relief valves

2.If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because theA.cylinder compression pressure may not be high enoughB.cylinder compression temperature may be too highC.fuel oil injection pressure may not be high enoughD.scavenge and purge process is incomplete

3.In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.A.low firing pressureB.low exhaust temperatureC.mechanical knock in each cylinderD.fuel knock in each cylinder

4.High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).A.decreased piston to cylinder head clearanceB.increased exhaust system back pressureC.early fuel injection timingD.low scavenge air temperature

更多“In some diesel engine designs,（）the injection of cylinder oi”相关问题

  • 第1题：

    单选题
    If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?（）
    A

    Increase the cooling water flow to the engine

    B

    Secure or reduce fuel to that cylinder

    C

    Screw down on the pressure adjusting spring to decrease to decrease popping pressure

    D

    Readjust the injection timing


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）
    A

    excessively late injection timing for each cylinder

    B

    incorrectly adjusted intake valve timing

    C

    incorrectly adjusted fuel injector

    D

    incorrectly adjusted intake valve clearance


    正确答案： A
    解析： 暂无解析

  • 第3题：

    单选题
    In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.
    A

    fluctuates with the engine speed to some extent, independent of the engine speed

    B

    keeps constant at all engine speed, dependent on the engine speed to some extent

    C

    keeps constant at all engine speed, independent of the engine speed

    D

    is decided by the engine speed, constant at all engine speed


    正确答案： B
    解析： 暂无解析

  • 第4题：

    单选题
    The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
    A

    the size of the holes in the fuel nozzle

    B

    timing of the pump

    C

    supply pressure to the pump

    D

    shape of the combustion chamber


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）
    A

    the firing pressure in the cylinder

    B

    a metering helix inside the pump

    C

    varying the physical length of the plunger stroke

    D

    varying the clearance between the injector cam and the injector rocker arm


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）
    A

    early injection timing

    B

    worn orifices in the injection nozzles

    C

    worn or scored cylinder liners

    D

    using a fuel with too low of a cetane number


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）
    A

    Excessively early injection timing

    B

    Combustion knock

    C

    Leaking piston rings

    D

    Light load


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and （）
    A

    low exhaust temperature

    B

    low firing pressure

    C

    fuel knock in each cylinder

    D

    mechanical knock in each cylinder


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The purpose of compressing the air within the cylinder of a diesel engine is to （）
    A

    produce the heat for ignition

    B

    decrease injection lag

    C

    increase ignition delay

    D

    aid in exhausting burnt gases


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）
    A

    increase the starting air pressure

    B

    use a higher than normal cranking speed

    C

    increase the fuel injection pressure

    D

    use a fuel having a lower ignition temperature


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）
    A

    feel the high pressure fuel line

    B

    check the cylinder exhausts for white smoke frequently

    C

    check the cylinder exhaust temperature

    D

    isolate each cylinder and inspect the injector


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
    A

    decreased piston to cylinder head clearance

    B

    increased exhaust system back pressure

    C

    early fuel injection timing

    D

    low scavenge air temperature


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）
    A

    low firing pressure

    B

    low exhaust temperature

    C

    mechanical knock in each cylinder

    D

    fuel knock in each cylinder


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）
    A

    backfire through the air intakes

    B

    develop less power under load

    C

    have high firing pressures

    D

    lift its cylinder relief valves


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    Late fuel injection in a diesel engine is indicated by low firing pressure with（）
    A

    high exhaust temperature

    B

    low exhaust temperature

    C

    fuel knock in each cylinder

    D

    mechanical knock in each cylinder


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    A faulty injection in one cylinder of an operating diesel engine can be located by （）
    A

    cutting out individual injectors and noting engine performance

    B

    checking lube oil temperature

    C

    checking cam position

    D

    using a timing light


    正确答案： C
    解析： 暂无解析

  • 第17题：

    单选题
    The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）
    A

    expansion of the combustion gases

    B

    exhaust and intake valves just closing

    C

    maximum compression is just being attained

    D

    fuel injection occurring at that point and combustion begins


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    In the cylinder of a diesel engine fuel is ignited by the（）
    A

    spark from a plug in the pre-combustion chamber

    B

    electrical discharge from the distributor

    C

    heat of compression within the cylinder

    D

    heat from the fuel injection nozzle


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except（）
    A

    open the indicator cocks

    B

    supply some CYL Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)

    C

    put the fuel handle in the “stop” position

    D

    pump up the air bottle


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    Misfiring in a diesel engine at light loads can be caused by（）
    A

    high lube oil temperature

    B

    low lube oil temperature

    C

    excessive cylinder cooling

    D

    high air injection pressure


    正确答案： D
    解析： 暂无解析

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