单选题（）are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.A Slow speed diesel enginesB Medium-speed diesel enginesC Steam enginesD Gasoline engines

题目
单选题
（）are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.
A

Slow speed diesel engines

B

Medium-speed diesel engines

C

Steam engines

D

Gasoline engines

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.When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be______.A.disengaging the clutch firstly, then stopping the main engineB.stopping the main engine firstly, then disengaging the clutchC.stopping the cooling water pump firstly, then stopping the main engineD.stopping the main engine and disengaging the clutch at the same time

3.Lubrication for the main reduction gears used with diesel engines is usually supplied byA.oil from the main engine sumpB.an independent lube oil systemC.the stern bearing head tankD.the stem bearing sump tank

4.Vessels having main engines arranged for air starting are to be provided with at least__.A.one automatic drain serving both containersB.two air starting containers of approximately equal sizeC.one control air container and one starting air containerD.one additional means of starting the main engine

更多“（）are increasingly used as main engine on merchant vessels,”相关问题

  • 第1题：

    The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.

    A.large conical springs

    B.compressed air pressure

    C.hydraulic pressure

    D.exhaust gas pressure


    正确答案：B

  • 第2题：

    The most common type of davit found on merchant vessels today is the ______．

    A.Radial

    B.Sheath-screw

    C.Gravity

    D.Quadrantal


    正确答案：C

  • 第3题：

    The WebSphere Commerce Payments architecture includes a Payment Servlet and a Payment Engine. The Payment Engine is the ONLY component that：（）

    • A、writes payment information to the database
    • B、relays incoming HTTP requests
    • C、writes payment information to the HTTP server
    • D、maps authenticated users to merchant roles

    正确答案:A

  • 第4题：

    单选题
    （） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.
    A

    The medium speed 4-stroke trunk piston engine

    B

    The low speed 2-stroke crosshead engine

    C

    The medium speed 2-stroke crosshead engine

    D

    The low speed 4-stroke trunk piston engine


    正确答案： A
    解析： 暂无解析

  • 第5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6题：

    单选题
    The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
    A

    four-stroke

    B

    two-stroke

    C

    slow speed

    D

    reversible


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.
    A

    water

    B

    oil

    C

    heat

    D

    steam


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.
    A

    alternator

    B

    turbo-charger

    C

    remote controller

    D

    windlass


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be（）
    A

    disengaging the clutch firstly, then stopping the main engine

    B

    stopping the main engine firstly, then disengaging the clutch

    C

    stopping the cooling water pump firstly, then stopping the main engine

    D

    stopping the main engine and disengaging the clutch at the same time


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following statements concerning the lubrication of diesel propulsion engines used in vessels over 300 gross tons is most accurate?（）
    A

    Lubrication systems using engine driven lube oil pumps do not require any additional independent arrangement when such arrangements have been proven reliable

    B

    The use of engine driven pre-lube pumps is permitted on vessels with propulsion systems developing less than 500 shaft horsepower

    C

    When forced lubrication is used for propulsion engines, one independently driven stand-by pumps is to be provided in addition to the necessary pumps for normal operation

    D

    Lubrication systems where two oil coolers are fitted require a minimum of two temperature control devices which may be actuated by similar sensors


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.
    A

    two fuel oil transfer pumps provided where one is to be independent of the main engine

    B

    two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engine

    C

    engine driven transfer pumps and only used in constant speed applications

    D

    the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.
    A

    large conical springs

    B

    compressed air pressure

    C

    hydraulic pressure

    D

    exhaust gas pressure


    正确答案： D
    解析： 暂无解析

  • 第13题：

    In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .

    A.all of the oil used by the engine through a filter

    B.some of the oil used by the engine through a filter

    C.some of the oil used by the engine through a centrifuge

    D.all of the oil used by the engine through a centrifuge


    正确答案：C

  • 第14题：

    Most propellers on merchant vessels are constructed of______．

    A.manganese bronze

    B.cast iron

    C.mild steel

    D.improved plow steel


    正确答案：A
    许多船舶的螺旋桨都是锰铜做的。

  • 第15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16题：

    单选题
    Fire detecting systems on merchant vessels may be arranged to sense （）.
    A

    smoke

    B

    rate of temperature rise

    C

    ionized particles

    D

    all of the above


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
    A

    four-stroke

    B

    two-stroke

    C

    slow speed

    D

    reversible


    正确答案： C
    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
    In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.
    A

    an diesel oil heater

    B

    a waste heat boiler

    C

    a fresh water generator

    D

    all the above


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    Propulsion of the vast majority of contemporary merchant ships (especially containerships and VLCCs) utilizes（） as prime mover.
    A

    gas turbine

    B

    diesel engine

    C

    steam engine

    D

    gasoline engine


    正确答案： A
    解析： 暂无解析

  • 第21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22题：

    单选题
    The most common forms of main drive used on deck auxiliaries are （）.
    A

    steam plants, electric motors and compressed air

    B

    diesel engine, hydraulic machinery and compressed air

    C

    steam plants, electric motors and hydraulic machinery

    D

    diesel engines, steam plants and hydraulic machinery


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    The purpose of engine stand-by is that （）
    A

    the main engine in the stand-by condition

    B

    auxiliary machinery in the stand-by condition

    C

    dynamical equipments in the stand-by condition and could be used immediately

    D

    A and B


    正确答案： B
    解析： 暂无解析

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