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 airB handle；solenoidC handle；pilot air coming through the distributorD solenoid；pilot air coming through the distributor

题目
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

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.The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.A.steam demand is highB.salinity is highC.safety valve simmers(爆发)D.burner flame is extinguished

3.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

4.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

更多“In the starting system, the automatic valve is controlled by”相关问题

  • 第1题：

    单选题
    Vessels having main engines arranged for air starting are to be provided with at least （）
    A

    one automatic drain serving both containers

    B

    two air starting containers of approximately equal size

    C

    one control air container and one starting air container

    D

    one additional means of starting the main engine


    正确答案： A
    解析： 暂无解析

  • 第2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3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4题：

    单选题
    Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）
    A

    Electric power and starting air

    B

    Lube oil standby pump and control air

    C

    Hydraulic switch and engage jacking gear

    D

    Motor drain and pneumatic control system power


    正确答案： D
    解析： 暂无解析

  • 第5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6题：

    单选题
    The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）
    A

    steam demand is high

    B

    salinity is high

    C

    safety valve simmers

    D

    burner flame is extinguished


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
    A

    suction service valve as a vapor

    B

    suction service valve as a liquid

    C

    discharge service valve as a vapor

    D

    charging valve as a liquid


    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
    The low pressure side of a refrigeration system is considered to exist from the （）.
    A

    expansion valve to the compressor

    B

    receiver to the expansion coil

    C

    expansion valve to the evaporator

    D

    condenser to the expansion valve


    正确答案： A
    解析： 暂无解析

  • 第10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11题：

    单选题
    The diesel engine valve subjected to most severe conditions of service is the （）.
    A

    cylinder exhaust valve

    B

    air starting valve

    C

    air inlet valve

    D

    cylinder relief valve


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
    A

    regulating the level of corrosion inhibitor in the primary cooling system

    B

    the level of the freshwater expansion tank

    C

    varying the engine load to meet temperature requirements

    D

    the operation of the thermostatic valve


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.
    A

    cargo pump failure

    B

    blower failure

    C

    deck seal low water level

    D

    low inert gas temperature


    正确答案： C
    解析： 暂无解析

  • 第14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15题：

    单选题
    The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.
    A

    a system with a Hydraulic Power Supply (HPS) unit

    B

    a system with roller guides for exhaust valves

    C

    a system with an electronically controlled Alpha Lubricator

    D

    a system directly powered by electric motor


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    Diesel engine air start valve timing is controlled by（）
    A

    engine operating speed

    B

    an air manifold

    C

    a hydraulic distributor

    D

    individual cams and valve gear


    正确答案： C
    解析： 暂无解析

  • 第17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18题：

    单选题
    Starting air valves are held firmly on their seats by（）
    A

    cam rollers on the camshaft

    B

    spring force

    C

    air pressure on top of the valve differential piston

    D

    air pressure on the bottom of the valve differential piston


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    When starting a centrifugal pump, the discharge valve should be （）.
    A

    closed

    B

    opened fully

    C

    cracked open

    D

    partly open


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    In a refrigeration system, if the cooling water to the condenser fails, the（）.
    A

    box temperature solenoid valve will close

    B

    expansion valve will close

    C

    compressor will shutdown

    D

    king valve will open


    正确答案： A
    解析： 暂无解析

  • 第21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22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

  • 第24题：

    单选题
    Control valves of a CO2 system may be located within the protected space when（）.
    A

    it is impractical to locate them outside

    B

    there is also a control valve outside

    C

    the CO2 cylinders are also in the space

    D

    an automatic heat-sensing trip is installed


    正确答案： A
    解析： 暂无解析

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