Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.A.entirely constant pressureB.entirely constant temperatureC.a combination of constant volume and constant pressureD.a comb

题目

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.

A.entirely constant pressure

B.entirely constant temperature

C.a combination of constant volume and constant pressure

D.a combination of constant temperature and constant pressure

相似考题

1.One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the_______.A.governor sensitivityB.exhaust temperatureC.fuel injection pressureD.speed of the cam shaft

2.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

3.单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）A quantity of fuel injected is decreasedB quantity of fuel injected will always be increasedC start of injection is advancedD duration of injection will always be greater

4._______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.A.Excessive fuel nozzle holder coolingB.Sediment in the fuel supplyC.Distortion of the fuel spray patternD.Improper atomization of the fuel

更多“Modern marine diesel engines equipped with mechanical fuel injection operate on a combusti ”相关问题

  • 第1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： D
    解析： 暂无解析

  • 第2题：

    单选题
    Problems with the diesel engine fuel injection pump are usually caused by（）
    A

    improper adjustment

    B

    contaminated fuel

    C

    kinked fuel lines

    D

    excessive engine vibration


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.
    A

    caused by retarded injection timing

    B

    caused by a mechanical defect in one cylinder

    C

    caused by high fuel injection pressures

    D

    normal for these conditions


    正确答案： B
    解析： 暂无解析

  • 第4题：

    单选题
    The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
    A

    two-stroke

    B

    four-stoke

    C

    long-stroke

    D

    short-stroke


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    Turbulence is created in the cylinders of a diesel engine to （）
    A

    obtain injection lag

    B

    help mix fuel and air

    C

    increase combustion pressure

    D

    utilize higher injection pressures


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    The high pressure in fuel injection system of the diesel engine is produced by the （）.
    A

    injector pump

    B

    fuel injector

    C

    governor

    D

    turbocharger


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）
    A

    camshaft

    B

    crankshaft

    C

    governor

    D

    flywheel


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    Injection lag in a diesel engine may be caused by（）
    A

    a higher cetane number of fuel oil

    B

    the diesel fuel used having a high viscosity

    C

    mechanical rigidity in the lube pump mechanism

    D

    a decrease rigidity in the fuel pump delivery pressure


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    Significant retardation of a diesel engine fuel injection timing will result in （）
    A

    smoother engine operation

    B

    advanced fuel ignition

    C

    increased fuel economy

    D

    reduced engine power


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Fuel injected into a diesel engines cylinder is ignited by （）.
    A

    the heat compressed fuel/air mixture in the cylinder

    B

    the fuel igniter

    C

    the fuel injector

    D

    the fuel pump


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
    A

    a combination of constant volume and constant pressure

    B

    a combination of constant temperature and constant pressure

    C

    entirely constant pressure

    D

    entirely constant volume


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）
    A

    entirely constant pressure

    B

    entirely constant temperature

    C

    a combination of constant volume and constant pressure

    D

    a combination of constant temperature and constant pressure


    正确答案： C
    解析： 暂无解析

  • 第13题：

    单选题
    The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
    A

    corrosion and grooving of exhaust valves

    B

    corrosion and gumming of the fuel injection pump

    C

    salt deposits in the exhaust manifold

    D

    slag deposits in the fuel injection equipment


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    On most diesel engines, the governor controls the output speed by （）.
    A

    controlling the amount of fuel injected into the cylinders

    B

    varying the speed of the turbocharger

    C

    adjusting the compression ratio

    D

    changing the timing of the fuel injection camshaft


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）
    A

    Quantity of fuel injected tends to be decreased

    B

    Quantity of fuel injected will always be increased

    C

    Start of injection tends to be advanced

    D

    Duration of injection will always greater


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    Diesel engines are considered safer than gasoline engines because（）.
    A

    they are more heavily built

    B

    the fuel used is less volatile

    C

    they can be easily reversed

    D

    they operate at a lower speed


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    Cylinders of marine diesel engines are normally cooled by （）.
    A

    sea water

    B

    fine mineral oil

    C

    sanitary water

    D

    fresh water


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the （）
    A

    governor sensitivity

    B

    exhaust temperature

    C

    fuel injection pressure

    D

    speed of the can shaft


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the following is true about the fuel injection with an ordinary diesel engine?（）
    A

    The process begins after TDC

    B

    The process ends before TDC

    C

    When the piston is near to the TDC the fuel injection ends

    D

    None of the above is true


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
    A

    assist in a quick cutoff of fuel injection

    B

    allow oil backflow from the injector to the helix

    C

    reduce fuel oil pressure between injection strokes

    D

    meter the quantity of fuel delivered


    正确答案： C
    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： C
    解析： 暂无解析

  • 第22题：

    单选题
    In common rail engines, the fuel is（） before is injected into the cylinders.
    A

    stored in a common fuel line

    B

    pumped by the injection pump

    C

    at low pressure

    D

    already atomized


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）
    A

    governor flyweight action on a pilot valve which controls fuel injection

    B

    governor flyweight motion acting on fuel controls through suitable linkage

    C

    positioning a butterfly valve in the fuel delivery system positioning

    D

    a servomotor piston attached to the fuel controls


    正确答案： C
    解析： 暂无解析

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