单选题If a diesel engine is smoking excessively under load, the cause could be （）A low exhaust back pressureB early fuel injection in one of the cylindersC compression pressure in one of the cylindersD plugged injector holes

题目
单选题
If a diesel engine is smoking excessively under load, the cause could be （）
A

low exhaust back pressure

B

early fuel injection in one of the cylinders

C

compression pressure in one of the cylinders

D

plugged injector holes

相似考题

1.An increase in load on a diesel engine results in _____ of speed of the crankshaft.A.a reductionB.an increaseC.an outingD.a downwards

2.单选题Load control on a diesel engine is accomplished by （）.A regulating the speed of the turbochargerB rotating the fuel injector pump plungerC regulating the speed of the fuel oil transfer pumpD changing engine timing

3.单选题Under manoeuvring condition the main engine may run on （）.A gas oilB marine diesel oilC residue oilD crude oil

4.In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the _____.A.governor droopB.speeder spring tensionC.fuel rack lagD.load on the engine

更多“If a diesel engine is smoking excessively under load, the ca”相关问题

  • 第1题：

    单选题
    If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）
    A

    insufficient fuel supply

    B

    faulty governor

    C

    high exhaust back pressure

    D

    all of the above may cause this problem


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
    A

    prevent engine back pressure at heavy loads

    B

    increase total engine efficiency at low loads

    C

    prevent boiler corrosion at low engine loads

    D

    improve engine fuel consumption at any load


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
    A

    chromium plating piston rings

    B

    knurling the piston skirt

    C

    extended maximum power operation

    D

    applying load to a cold diesel engine


    正确答案： D
    解析： 暂无解析

  • 第4题：

    单选题
    Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
    A

    burned exhaust valves

    B

    excessive spring compression

    C

    spring surge

    D

    worn valve seats


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.
    A

    reduce the engine driven fuel pump outlet pressure

    B

    retard the fuel injector timing to reduce power

    C

    increase the fuel rack setting

    D

    reduce the load on the engine


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）
    A

    bedplate or base

    B

    sump or oil pan

    C

    cylinder block

    D

    frame


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    If a diesel engine is smoking excessively under load, the cause could be （）
    A

    low exhaust back pressure

    B

    early fuel injection in one of the cylinders

    C

    compression pressure in one of the cylinders

    D

    plugged injector holes


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    Maximum horsepower of a diesel engine is attained （）.
    A

    when the engine RPM is pulled down by overload

    B

    at rated engine RPM

    C

    at 95 % of rated engine RPM

    D

    at 95 % of a properly adjusted governor RPM with the engine under full load


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The exhaust gases for a new engine should be （） when the engine operates under full load.
    A

    smoky

    B

    a little bit dense

    C

    visible

    D

    almost invisible


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to （）
    A

    decrease only

    B

    increase only

    C

    decrease slightly then returned to original speed

    D

    increase slightly then returned to original speed


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）
    A

    decrease until the engine speed increases

    B

    increase as the load increases

    C

    decrease as the load

    D

    increases remain unchanged


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）
    A

    reduce load

    B

    check your exhaust

    C

    adjust cooling water temperature

    D

    increase lube oil flow


    正确答案： A
    解析： 暂无解析

  • 第13题：

    单选题
    One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）
    A

    reduce lube oil temperature

    B

    raise exhaust temperature reduce

    C

    excessive heating of engine room

    D

    reduce load on cooling water pump


    正确答案： C
    解析： 暂无解析

  • 第14题：

    单选题
    A diesel engine is supercharged in order to（）
    A

    lower the no-load RPMs

    B

    provide more air for combine with the fuel

    C

    increase the no-load RPMs

    D

    provide more fuel combine with the air


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）
    A

    air quantity aspirated

    B

    fuel injection pressure

    C

    combustion pressure on the power stroke

    D

    compression on the compression stroke


    正确答案： A
    解析： 暂无解析

  • 第16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17题：

    单选题
    In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）
    A

    Bed plate

    B

    Column

    C

    Entablature

    D

    Tie rod


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
    A

    raw water pump discharge

    B

    expansion tank outlet

    C

    cooling water heat exchanger

    D

    outlet engine jacket water outlet


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）
    A

    decrease in ignition lag

    B

    increase in fuel economy

    C

    reduction in lube oil viscosity

    D

    increase in cylinder misfiring


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）
    A

    has little or no internal friction

    B

    has a lower effective compression ratio

    C

    operates with scavenge air under a positive pressure

    D

    operates without energy absorbing intake and exhaust strokes


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    An increase in load on a diesel engine results in （） of speed of the crankshaft.
    A

    a reduction

    B

    an increase

    C

    an outing

    D

    a downwards


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    A restricted air intake to a diesel engine may result in the engine （）.
    A

    failing to reach rated speed

    B

    knocking under maximum load

    C

    hunting or surging under light load

    D

    overspeeding and running away


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.
    A

    reduce the engine load

    B

    increase the cooling water flow

    C

    increase the lube oil pressure

    D

    adjust the fuel rack


    正确答案： B
    解析： 暂无解析

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