During sea trial, the main engine well be kept run at load.A.100%B.110%C.85%D.different

题目

During sea trial, the main engine well be kept run at load.

A.100%

B.110%

C.85%

D.different

相似考题

1.While sailing in ballast under normal weather and sea condition, the basic parameter which is used to restrict the fuel injection of main engine isA.the exhaust temperatureB.the speed of main engineC.the turbine rotation speedD.the power of main engine

2.During the dock repair,______should be measured firstly before tail shaft drawn out.A.the sinking of tail shaftB.the clearance of stern bearingC.the total flexure of shaftD.main engine crankshaft deflection

3.Before "stand by" is rung on the engine telegraph, it is usual to give the main diesel engine a brief trial ahead and astern.A.with powerB.on powerC.with airD.on air

4.During sea trial, the main engine will be kept run at______loadA.100%B.110%C.85%D.different

参考答案和解析
正确答案：D
更多“During sea trial, the main engine well be kept run at load.A.100%B.110%C.85%D.different ”相关问题

  • 第1题：

    Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?

    A.Baffle plates that have been bent during prior removal

    B.Leaks m the cooler tube nest

    C.Operating the engine while maintaining a high sea water outlet temperature

    D.A punctured sea water strainer supplying cooling water to the heat exchanger


    正确答案：C

  • 第2题：

    单选题
    The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）
    A

    the same, whether at sea, or during maneuvering

    B

    adjusted during each hour of operation while at constant RPM

    C

    higher at sea than while maneuvering

    D

    lower at sea than while maneuvering


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    Under manoeuvring condition the main engine may run on （）.
    A

    gas oil

    B

    marine diesel oil

    C

    residue oil

    D

    crude oil


    正确答案： B
    解析： 暂无解析

  • 第4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5题：

    单选题
    When ship navigating in rough sea, the first measure taken by the chief engineer to prevent the overload should be（）
    A

    cleaning fuel oil, lubricating oil and seawater filter

    B

    reducing fuel feeding of the main engine appropriately or reducing the pitch angle of propeller

    C

    using low sea chest

    D

    closing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    The load limitation of governor should be reduced when ship navigating at sea, the main reason is to（）
    A

    prevent the diesel engine surging

    B

    prevent governor from being damaged because of swing

    C

    reduce the probability of the crank shaft being torsional vibrated and resonated

    D

    prevent the main engine being overload or overspeed


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.
    A

    the highest

    B

    above 3/4

    C

    1/2-3/4

    D

    the lowest


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    UMS are mainly unattended overnight and during this time （） should have control of the main engine.
    A

    the chief engineer

    B

    the engineer on cabin watch

    C

    the bridge officer on watch

    D

    the master


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    After finished the engine, which of valves cannot be shut off by the duty engineer?（）
    A

    fuel valve

    B

    the starting air valve

    C

    the sea chest

    D

    the main sea pump inlet valve


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.
    A

    a brief trial with turning gear

    B

    a brief trial on power

    C

    a long trial by steering gear

    D

    one minutes trial with windlass


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    During the watch keeping at sea, at appropriate intervals inspection should be made of （）, auxiliary machinery and steering gear spaces by the duty engineer.
    A

    the main propulsion plant

    B

    lifesaving jackets

    C

    lifeboat engine

    D

    state of emergency generator


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    During sea trial, the main engine well be kept run at load（）
    A

    100%

    B

    110%

    C

    85%

    D

    different


    正确答案： A
    解析： 暂无解析

  • 第13题：

    材料：

    Spark erosion is caused by a voltage discharge between the main bearing and journal surface. The cause of the potential is the development of a galvanic element between the ship’s hull, sea water, and the propeller shaft/crankshaft.

    The oil film acts as a dielectric. The puncture voltage in the bearing depends on the thickness of the oil film. With increasing engine ratings, the specific load in the main bearing is increased. his will reduce the oil film thickness, and enable the discharge to take place at a lower voltage level.

    Since the hydrodynamic oil film thickness varies through a rotation cycle, the discharge will take place at roughly the same instant during each rotation cycle, i.e. when the film thickness is at its minimum. The roughening will accordingly be concentrated in certain areas on the journal surface. In the early stages, the roughened areas can resemble pitting erosion. but later, as the roughness increases, the small craters will scrape off and pick up white metal-hence the silvery white appearance.

    Therefore, to ensure protection against spark erosion, the potential level must be kept at maximum 80 mV, which is feasible today with a high efficiency earthing device. If an earthing device is installed, its effectiveness must be checked regularly. Spark erosion is only observed in main bearings and main bearing journals.

    问题：

    According to the paragraph one, a voltage between the main bearing and journal surface is produced by______.

    A.propeller rotation

    B.leakage from M/E electric control unit

    C.a galvanic element

    D.friction between the main bearing and journal surface

    ______engine ratings increase, the hydrodynamic oil film between the main bearing and journal surface is______.A.The lower/thinner

    B.The higher/the thicker

    C.The lower/thicker

    D.The higher/thinner

    When will the spark erosion take place on the journal surface during each rotation cycle?A.when the film thickness is at its minimum

    B.when the film thickness is at its maximum

    C.when the engine is on its compression stroke

    D.when the engine is on its exhaust stroke

    During the engine room watch keeping, which equipment must be noted to ensure protection against spark erosion?A.the antifouling plant

    B.the earthing device

    C.the main engine electric heating coils

    D.the shaft generator

    请帮忙给出每个问题的正确答案和分析，谢谢！


    问题 1 答案解析：C


    问题 2 答案解析：D


    问题 3 答案解析：A


    问题 4 答案解析：B

  • 第14题：

    单选题
    Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）
    A

    Baffle plates that have been bent during prior removal

    B

    Leaks in the cooler tube nest

    C

    Operating the engine while maintaining a high sea water outlet temperature

    D

    A punctured sea water strainer supplying cooling water to the heat exchanger


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    In modern installations, the main engine and the standby auxiliary engines（）
    A

    can be started at low temperature and are free from preheating

    B

    usually are preheated by steam before being started

    C

    are kept at a constant temperature and free from preheating

    D

    are kept at a low temperature to save energy


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）
    A

    To reduce the main engine speed

    B

    To increase the main engine speed

    C

    To govern the main engine speed

    D

    To fix the propeller shaft


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    Whether a ship is sailing before the wind or sailing in the rough sea, we must reduce the fuel injection of the main engine.For the former one, it aims to prevent the main engine being（）, while for the later one, it aims to prevent the main engine being（）.
    A

    overspeed；overload

    B

    overload；overspeed

    C

    over torque；overspeed

    D

    low mechanical efficiency；overload


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）
    A

    Flywheel inertia

    B

    Admission of starting air

    C

    The way of the vessel

    D

    securing of fuel to the cylinders


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
    A

    cylinder heads

    B

    exhaust valves

    C

    scavenging air

    D

    injectors


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    During the watch at sea （） should be logged or recorded in the engine log book.
    A

    the running hours of the cooling water pump

    B

    chief engineer’s order

    C

    the main parameters of main and auxiliary equipment

    D

    the position of the vessel


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
    A

    the highest

    B

    above 3/4

    C

    1/2 -3/4

    D

    the lowest


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    While sailing under normal weather and sea condition, the basic parameter which is used to restrict the fuel injection of main engine is （）
    A

    power of main engine

    B

    turbine rotation speed

    C

    speed of main engine

    D

    exhaust temperature


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）
    A

    chief engineer

    B

    surveyor

    C

    the engineer

    D

    the technique personnel of the shipyard


    正确答案： B
    解析： 暂无解析

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