单选题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）A ImpellerB CompressorC After-coolerD Exhaust differ

题目
单选题
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A

Impeller

B

Compressor

C

After-cooler

D

Exhaust differ

相似考题

1.Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?A.ViscosityB.Sulfur contentC.Pour pointD.Cetane number

2.单选题An increase in diesel engine crankcase pressure generally indicates excessive（）A compression pressureB lube oil header pressureC scavenge air pressureD piston ring blow-by

3.单选题Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）A clogged air filterB compression strokeC burned exhaust valvesD all of the above

4.What is the function of the after-coolers installed in the diesel engine air intake system?A.Decrease the air densityB.Increase the exhaust temperatureC.Decrease the lube oil temperatureD.Increase the air density

更多“Which of the diesel engine components listed increase air de”相关问题

  • 第1题：

    单选题
    Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）
    A

    Intake manifold

    B

    Water-cooled exhaust system

    C

    After-cooler

    D

    Exhaust diffuser


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）
    A

    Lubrication

    B

    Cooling

    C

    Fuel

    D

    Electric ignition


    正确答案： A
    解析： 暂无解析

  • 第3题：

    单选题
    Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）
    A

    Exhaust temperature

    B

    Lube oil level

    C

    Lube oil pressure

    D

    Water level in the expansion tank


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
    A

    Exhaust and scavenging

    B

    Scavenging and compression

    C

    Ignition and expansion

    D

    Exhaust and compression


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
    A

    reduce water temperature

    B

    reduce water turbulence

    C

    provide an air cushion

    D

    allow for an increase in water volume as the engine warms up


    正确答案： B
    解析： 暂无解析

  • 第6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7题：

    单选题
    Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）
    A

    Reduce engine speed to idle before removing the filter

    B

    Soak the dirty filter in kerosene only

    C

    Blow out the air inlet with compressed air

    D

    Cover the air inlet after removing the filter


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?（）
    A

    Viscosity

    B

    Sulfur content

    C

    Pour point

    D

    Cetane number


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?（）
    A

    Pre-lube cylinders with hand cranks

    B

    Open all air space drain cocks

    C

    Open all indicator valves

    D

    All of the above


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.
    A

    decrease in maximum cylinder pressure

    B

    increase in ignition lag

    C

    decrease in fuel consumption per horsepower-hour

    D

    decrease in exhaust manifold pressure


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    “This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）
    A

    a modern diesel engine；a turbine wheel

    B

    a modem diesel engine；exhaust gases

    C

    a compressor；an exhaust gas turbocharger

    D

    a compressor；a turbine wheel


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）
    A

    Low cooling water outlet temperature

    B

    High lube oil pressure

    C

    Low lube oil temperature

    D

    Low starting air pressure


    正确答案： A
    解析： 暂无解析

  • 第13题：

    单选题
    Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）
    A

    Hydraulic stress and distortion will develop

    B

    Hot spots will develop

    C

    Fuel oil viscosity will increased

    D

    An increase in trapped deposits of scale and dirt


    正确答案： C
    解析： 暂无解析

  • 第14题：

    单选题
    Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）
    A

    Holding the valve open for a long period

    B

    Increasing the starting air pressure used

    C

    Opening the stating air valve quickly

    D

    Reducing the starting air valve size


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）
    A

    Loss of compression for that cylinder

    B

    Misfiring or rough running

    C

    Damage to the valve

    D

    All of the above


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
    A

    Exhaust temperatures

    B

    Raw water pressure

    C

    Lube oil pressure

    D

    Air box pressure


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）
    A

    Fuel

    B

    Lubricating

    C

    Cooling

    D

    Ignition


    正确答案： C
    解析： 暂无解析

  • 第18题：

    单选题
    The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.
    A

    air bottle

    B

    air compressor

    C

    crank case

    D

    combustion chamber


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）
    A

    Atomization

    B

    Metering

    C

    Effective stroke

    D

    Penetration


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）
    A

    Intake stroke

    B

    Compression stroke

    C

    Exhaust stroke

    D

    Pumping stroke


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will（）
    A

    lag behind the increased fuel supplied to the engine

    B

    enter the engine along with the increase in the fuel

    C

    enter the engine before the increased fuel supply

    D

    leave the turbocharger as a negative pulse


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）
    A

    noise coming from that air starting valve

    B

    continuous operation of the starting air compressor

    C

    zero air pressure in the air starting system

    D

    overheated starting air pipe to the cylinder head


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    Following an overhaul of a crosshead type diesel engine, the engine is jacked over with the turning gear as part of the pre-start procedure, which of the listed pre-start procedures should be carried out?（）
    A

    Ensure proper cylinder lube oil flow

    B

    Open all air space drain cocks

    C

    Open all indicator valves

    D

    all of the above


    正确答案： C
    解析： 暂无解析

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