单选题In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）A the inlet port is opened by the up coming piston； the port is closed by the down goingB the inlet valve is opened by the down going piston；the inlet valve is closedC

题目
单选题
In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）
A

the inlet port is opened by the up coming piston； the port is closed by the down going

B

the inlet valve is opened by the down going piston；the inlet valve is closed

C

the inlet port is opened by the down going piston；the port is closed by the up coming

D

the inlet valve is opened

相似考题

1.---Slow ahead both engines! ---Slow ahead both engines! ___________________!A.Both engines slow aheadB.Engine slow ahead portC.Engine slow ahead starboardD.Engine both ahead

2.The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A.fed from mechanical lubricatorsB.thrown off from the main bearingsC.supplied from wick fed drip lubricatorsD.flow from a centrifugal or banjo oiler

3.低速控制（）A、low-speed controlB、inching controlC、high-speed controlD、slow-speed control

4.Slow ahead_______ engines!A.withB.bothC.andD.to

更多“In slow speed two-stroke engines,（）the fresh air entering be”相关问题

  • 第1题：

    Slow ahead（）engines!

    • A、with
    • B、both
    • C、and
    • D、to

    正确答案:B

  • 第2题：

    单选题
    Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
    A

    a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine

    B

    a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine

    C

    two medium-speed, turbocharged, four-stroke diesel engines

    D

    a variable-speed AC generator


    正确答案： A
    解析： 暂无解析

  • 第3题：

    单选题
    Slow ahead（）engines!
    A

    with

    B

    both

    C

    and

    D

    to


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
    A

    fuel oil vapor at the sludge tank vent

    B

    unburned fuel vapors in the scavenge air receiver

    C

    lube oil vapors in the crank case

    D

    lube oil vapors in the engine room


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.
    A

    higher；reduced

    B

    higher；increased

    C

    lower；reduced

    D

    lower；increased


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    ---Slow ahead both engines! ---Slow ahead both engines! （）!
    A

    Both engines slow ahead

    B

    Engine slow ahead port

    C

    Engine slow ahead starboard

    D

    Engine both ahead


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）
    A

    During operation at low speed

    B

    During operation at rated speed, but low power output

    C

    During acceleration

    D

    All of the above


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
    A

    two crankshaft revolutions in a two-stroke/cycle engine

    B

    two power strokes in a two-stroke/cycle engine

    C

    one power stroke in a two-stroke/cycle engine

    D

    two piston strokes in a two-stroke/cycle engine


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）
    A

    exhaust manifold

    B

    valve bridge

    C

    pressure of the fresh air charge

    D

    valve adjusting gear


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
    A

    are made of

    B

    are made from

    C

    make use of

    D

    are used to


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）
    A

    early fuel injection

    B

    excessive bearing play within the running gear

    C

    overloading of the cylinder

    D

    all of the above


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）
    A

    the inlet port is opened by the up coming piston； the port is closed by the down going

    B

    the inlet valve is opened by the down going piston；the inlet valve is closed

    C

    the inlet port is opened by the down going piston；the port is closed by the up coming

    D

    the inlet valve is opened


    正确答案： A
    解析： 暂无解析

  • 第13题：

    单选题
    Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
    A

    less even torque

    B

    higher cylinder head temperatures

    C

    fewer power strokes per revolution

    D

    greater weight/size requirements


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）
    A

    one half crankshaft speed in a two-stroke cycle diesel engine

    B

    crankshaft speed in a two-stroke cycle diesel engine

    C

    two times crankshaft speed in a two-stroke cycle diesel engine

    D

    one-fourth times crankshaft speed in a four-stroke cycle diesel engine


    正确答案： A
    解析： 暂无解析

  • 第15题：

    单选题
    Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.
    A

    scavenging

    B

    starting

    C

    cooling

    D

    blowing


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
    A

    quantity of air it takes in and retains in the cylinders during a given time period

    B

    proportion of trapped air that is utilized in the combustion process

    C

    thermodynamic efficiency of the engine cycle

    D

    all of the above


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）
    A

    pumping action of the piston

    B

    pressure of the fuel charge

    C

    vacuum developed in the manifold

    D

    pressure of the fresh air charge


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）
    A

    White

    B

    Black

    C

    Blue

    D

    Clear


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）
    A

    The density of the air entering the compressor

    B

    The temperature of the air entering the compressor

    C

    The designed rotating speed of the compressor

    D

    A leaking head gasket


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）
    A

    In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater

    B

    Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports

    C

    No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine

    D

    The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Air compressor cylinder un-loaders enable the compressor to （）.
    A

    vary their speed according to temperature and load

    B

    start and come up to speed before air compression begins

    C

    change speed according to overload demands

    D

    reduce compressed air charge density


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    When occurring a fire in the scavenge air box, the following measures should be taken except for（）
    A

    reducing speed to SLOW and asking bridge for permission to stop

    B

    stopping the fuel oil supply

    C

    switching-on the auxiliary blowers

    D

    putting the scavenge air box fire extinguishing equipment into function


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）
    A

    one-half engine speed

    B

    the same as engine speed

    C

    twice engine speed

    D

    four times engine speed


    正确答案： B
    解析： 暂无解析

  • 第24题：

    单选题
    Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
    A

    make use of

    B

    have made the use of

    C

    by means of

    D

    make advantage of


    正确答案： C
    解析： 暂无解析

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