润滑油系统（lubrication system）

题目

润滑油系统（lubrication system）

相似考题

1.Which of the following statements concerning the lubrication of diesel propulsionengines used in vessels over 300 gross tons is most accurate? ( )A.Lubrication systems using engine driven lube oil pumps do not require any additionalindependent arrangement when such arrangements have been proven reliable.B.The use of engine driven pre-lube pumps is permitted on vessels with propulsionsystems developing less than 500 shaft horsepower.C.When forced lubrication is used for propulsion engines , one independently drivenstandby pumps is to be provided in addition to the necessary pumps for normaloperation.D.Lubrication systems where two oil coolers are fitted require a minimum of twotemperature control devices which may be actuated by similar sensors.

2.The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known asA.mechanical lubricatorB.lubrication functionC.forced feed systemD.bearing lubrication

3.Restrictions occurring in the small orifices(孔) of pneumatic control system components can be caused by ______.A.moisture in the compressed air supplyB.excessive dryness in the compressed air supplyC.pressure surging in the compressed air receiverD.insufficient lubrication of the system components

4.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

更多“润滑油系统（lubrication system）”相关问题

  • 第1题：

    The most serious effect of air trapped in a diesel engine jacket water cooling system is that it ______．

    A.Causes colloid suspension in the cooling water

    B.Reduces the capability of the lubrication system

    C.Can form pockets which block the flow of coolant through the system

    D.Leads to the scuffing of cylinder walls


    正确答案：D

  • 第2题：

    The major objective of system configuration management is which of the following?系统配置管理的主要目标是下列哪一个？（）

    • A、system tracking.系统跟踪
    • B、system operations.系统操作
    • C、system maintenance.系统维护
    • D、system stability.系统稳定性

    正确答案:D

  • 第3题：

    整个丙烷制冷压缩机系统可分为（）

    • A、润滑油压力系统、润滑油过滤系统、润滑油温度系统、负载控制、反循环系统和电动机互锁、前后级控制
    • B、润滑油温度系统、负载控制、反循环系统和电动机互锁，前后级控制
    • C、润滑油压力系统、润滑油过滤系统、润滑油温度系统、负载控制、前后级控制
    • D、润滑油压力系统、润滑油温度系统、负载控制、反循环系统和电动机互锁，前后级控制

    正确答案:A

  • 第4题：

    甲醇合成系统长期停车，对循环压缩机油系统应（）处理。

    • A、润滑油和密封油系统不停
    • B、润滑油和密封油系统都停
    • C、润滑油系统停，密封油系统不停
    • D、润滑油系统不停，密封油系统停

    正确答案:D

  • 第5题：

    英译汉：lubrication


    正确答案: 润滑

  • 第6题：

    单选题
    Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.
    A

    pump bearings in poor condition

    B

    excessively worn actuator-piston packing

    C

    broken directional control valve centering springs

    D

    low hydraulic oil viscosity


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    Restrictions occurring in the small orifices of pneumatic control system components can be used by （）
    A

    moisture in the compressed air supply

    B

    excessive dryness in the compressed air supply

    C

    pressure surging in the compressed air receiver

    D

    insufficient lubrication of the system components


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
    A

    causes colloid suspension in the cooling water

    B

    reduces the capability of the lubrication system

    C

    can form pockets which block the flow of coolant through the system

    D

    leads to the scuffing of cylinder walls


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    Oil pressure in the lubrication system is （） the static sea water head to ensure that sea water （） the stem-tube.
    A

    lower than；can lubricate

    B

    lower than；can cool

    C

    higher than；can enter

    D

    higher than ；cannot enter


    正确答案： A
    解析： 暂无解析

  • 第10题：

    问答题
    修改系统变量 Path 的值为%System Root%/ System32;% System Root%;% System Root%/ System32/wbem;D:/

    正确答案： 右击【我的电脑】→【属性】→【高级】→【环境变量】→选中path→【编辑】→输入“%SystemRoot%/System32；%SystemRoot%；%SystemRoot%/System32/wbem；D:///”→【确定】→【确定】
    解析： 暂无解析

  • 第11题：

    名词解释题
    英译汉：lubrication

    正确答案： 润滑
    解析： 暂无解析

  • 第12题：

    单选题
    If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, （）.
    A

    compressor lubrication will be improved

    B

    oil will not leave the crankcase

    C

    compressor valves will be damaged

    D

    oil may congeal in the evaporator


    正确答案： B
    解析： 暂无解析

  • 第13题：

    修改系统变量 Path 的值为%System Root%/ System32;% System Root%;% System Root%/ System32/wbem;D:/


    正确答案: 右击【我的电脑】→【属性】→【高级】→【环境变量】→选中path→【编辑】→输入“%SystemRoot%/System32；%SystemRoot%；%SystemRoot%/System32/wbem；D:///”→【确定】→【确定】

  • 第14题：

    系统调用的英文翻译为（）

    • A、call system
    • B、system need
    • C、system call
    • D、system

    正确答案:C

  • 第15题：

    关于往复压缩机润滑描述正确的是（）。

    • A、传动机构采用强制润滑系统
    • B、润滑油系统必须设置冷却系统
    • C、润滑油系统必须设置加热功能
    • D、润滑油系统必须设置过滤系统

    正确答案:A,B,C,D

  • 第16题：

    辅助给水系统/应急给水系统 auxiliary feed water system/emergency feed water system


    正确答案: 在蒸汽发生器主给水系统失效时，立即向蒸汽发生器供水的系统。也可作为反应堆启动、停堆时在主给水未投入的情况下向蒸汽发生器供水。

  • 第17题：

    单选题
    Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is（）
    A

    lubricating

    B

    cooling

    C

    cleaning

    D

    neutralizing


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.
    A

    lube oil pump suction line

    B

    lube oil pump discharge line

    C

    bottom of the lube oil sump

    D

    outlet from the lube oil header


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
    A

    cylinder liners and piston rings

    B

    main bearings

    C

    crankpin bearings

    D

    turboblower


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.
    A

    higher

    B

    lower

    C

    very higher

    D

    very lower


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
    A

    their free-floating design

    B

    their relatively small size

    C

    the reciprocating motion of the piston

    D

    their position in the lubrication system


    正确答案： D
    解析： 暂无解析

  • 第22题：

    多选题
    IEEE802.1x协议的体系结构包括（）。
    A

    Supplicant System客户端

    B

    Authenticator System认证系统

    C

    Account System认证计费系统

    D

    Authentication Server System认证服务器


    正确答案： A,C,D
    解析： 暂无解析

  • 第23题：

    单选题
    （）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.
    A

    Large crosshead type；crossheads

    B

    High speed；the cylinders

    C

    Large crosshead type；the cylinders

    D

    Four-stroke；pistons and cylinders


    正确答案： D
    解析： 暂无解析

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