In the event of the cylinder starting valve leakage ______would pass into the air pipes and ignite the oil deposited.A.cooling waterB.vapor from the boilerC.starting airD.hot gases

题目

In the event of the cylinder starting valve leakage ______would pass into the air pipes and ignite the oil deposited.

A.cooling water

B.vapor from the boiler

C.starting air

D.hot gases

相似考题

1.第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.The passage is mainly aboutA.crankcase explosionB.scavenge box fireC.starting air pipeD.the danger of explosion in the starting air system

2._______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.A.An air receiverB.An operating valveC.An automatic valveD.An air distributor

3.In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A.Noise coming from that air starting valveB.Continuous operation of the starting air compressorC.Zero air pressure in the air starting systemD.Overheated starting air pipe to the cylinder head

4.According to this passage, if the cylinder non-return valve were not leakyA.an explosion would not be causedB.there still would be a danger of explosionC.oil would not deposit in the air pipeD.pipe lines would not have to be drained

更多“In the event of the cylinder starting valve leakage ______would pass into the air pipes an ”相关问题

  • 第1题：

    单选题
    The opening or closing of the cylinder starting valve is controlled by （）.
    A

    the starting air distributor

    B

    the cut-off valve on the air main

    C

    the main starting valve

    D

    the air bottle control valve


    正确答案： D
    解析： 暂无解析

  • 第2题：

    单选题
    When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
    A

    intake stroke

    B

    compression stroke

    C

    power stroke

    D

    exhaust stroke


    正确答案： A
    解析： 暂无解析

  • 第3题：

    单选题
    The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.
    A

    BDC

    B

    TDC

    C

    BBDC

    D

    ATDC


    正确答案： A
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the following may cause that an engine doesnt run on starting air?（）
    A

    too low starting air pressure

    B

    main start valve closed

    C

    neither A nor B

    D

    A and B


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    Each cylinder has one starting valve which is usually opened by air pressure and closed by （）
    A

    nuts and bolts

    B

    new joints

    C

    spring force

    D

    sealing rings


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    （） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
    A

    An air receiver

    B

    An operating valve

    C

    An automatic valve

    D

    An air distributor


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
    A

    downwards；upwards

    B

    upwards；downwards

    C

    downwards；downwards

    D

    upwards；upwards


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    The cylinder cover is not provided with （）.
    A

    fuel valve

    B

    lubricator

    C

    indicator valve

    D

    the starting valve


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.
    A

    just

    B

    nearly

    C

    merely

    D

    already


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.
    A

    camshaft；fresh air

    B

    camshaft；starting air

    C

    electronic motor which is controlled by a computer；fresh air

    D

    electronic motor which is controlled by a computer；starting air


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）
    A

    Carbon build up in the piston ring belt

    B

    Faulty operation of a cylinder un-loader

    C

    Compressor operation in an area of high relative humidity

    D

    Lifting of intercooler rebel valve


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in （）
    A

    an air bound fuel system

    B

    damage to cylinder heads and pistons

    C

    excessive fuel injection

    D

    excessive air valve lift


    正确答案： A
    解析： 暂无解析

  • 第13题：

    单选题
    Which of the following may cause that an engine doesnt turn on starting air?（）
    A

    too low starting air pressure

    B

    main starting valve closed

    C

    neither A nor B

    D

    A and B


    正确答案： A
    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
    Opening of the cylinder （） will admit compressed air into the cylinder.
    A

    safety valve

    B

    indicator cock

    C

    blow-down valve

    D

    start valve


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    In the starting system, the automatic valve is controlled by（）, and the cylinder start valves are controlled by（）
    A

    pilot air；pilot air

    B

    handle；solenoid

    C

    handle；pilot air coming through the distributor

    D

    solenoid；pilot air coming through the distributor


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    Compressed air is supplied by air compression to （）.
    A

    the air receivers

    B

    the starting valves

    C

    the cylinder covers

    D

    the distributors


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.
    A

    cooling water

    B

    vapor from the boiler

    C

    starting air

    D

    hot gases


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    （） supplies pilot air to control the cylinder air start valves.
    A

    An air compressor

    B

    An indicator cock

    C

    An air distributor

    D

    A safety valve


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.
    A

    by an fuel valve

    B

    through an inlet valve

    C

    with an exhaust valve

    D

    from an outlet valve


    正确答案： B
    解析： 暂无解析

  • 第21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22题：

    单选题
    Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
    A

    improving cylinder scavenging

    B

    preheating the combustion chamber

    C

    reducing air charge density

    D

    preventing valve wear


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    The timing of diesel engine air starting valves is controlled by（）
    A

    the air start valve timing gears and rods

    B

    a cylinder check valve

    C

    individual cams and valve gear

    D

    an air manifold poppet valve


    正确答案： D
    解析： 暂无解析

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