Which lubricating oil additive is used in diesel engines to reduce the tendency(倾向)for sludge and varnish to form on the engine parts?A.Flash point improversB.Pour point improversC.InhibitorsD.Foam suppressors(抑制物)

题目

Which lubricating oil additive is used in diesel engines to reduce the tendency(倾向)for sludge and varnish to form on the engine parts?

A.Flash point improvers

B.Pour point improvers

C.Inhibitors

D.Foam suppressors(抑制物)

相似考题

1.Main engines as well as auxiliary engines operating on heavy fuel should have continuousoon the lubricating oil, either according tothebypass or batch principlesA.filteringB.centrifugingC.depositingD.operating

2.An additive used to improve the ability of a lube oil to reduce friction is known as a/anA.suppressant additiveB.dispersant additiveC.extreme pressure additiveD.viscosity improver additive

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.For most diesel propulsion and generator engines, the over-speed trip device will stop the engine byA.moving the governor control to stopB.shutting off the lubricating oil supplyC.tripping the governor emergency stop leverD.shutting off the fuel supply

更多“Which lubricating oil additive is used in diesel engines to reduce the tendency(倾向)for s ”相关问题

  • 第1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2题：

    单选题
    For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
    A

    moving the governor control to stop

    B

    shutting off the lubricating oil supply

    C

    tripping the governor emergency stop lever

    D

    shutting off the fuel supply


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）
    A

    cooling water leaving each cylinder

    B

    fuel oil entering the injector

    C

    exhaust gases at various locations

    D

    lube oil at the bearing supplies


    正确答案： A
    解析： 暂无解析

  • 第4题：

    单选题
    Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
    A

    fuel oil vapor at the sludge tank vent

    B

    unburned fuel vapors in the scavenge air receiver

    C

    lube oil vapors in the crank case

    D

    lube oil vapors in the engine room


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）
    A

    at the beginning of every watch

    B

    at the beginning of the first watch every day

    C

    at the completion of every watch

    D

    at noon every day


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）
    A

    filtering

    B

    centrifuging

    C

    depositing

    D

    operating


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    The booster pump, which supplies diesel oil to（） , should have a possibility of being powered by compressed air or by emergency power.
    A

    the main engines

    B

    the auxiliary engines

    C

    the emergency generator engine

    D

    the auxiliary engines and the main engine(s)


    正确答案： C
    解析： 暂无解析

  • 第8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9题：

    单选题
    （） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.
    A

    Except for

    B

    Beside

    C

    Except

    D

    In addition to


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
    A

    Splash

    B

    Gravity

    C

    Pressure

    D

    Bypass


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）
    A

    Flash point improvers

    B

    Pour point improvers

    C

    Inhibitors

    D

    Foam suppressors


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.
    A

    main bearings

    B

    connecting rod bearings

    C

    piston pin bushings

    D

    All of the above


    正确答案： A
    解析： 暂无解析

  • 第13题：

    单选题
    Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
    A

    water in the fuel

    B

    insufficient fuel for combustion

    C

    clogged air intake passages

    D

    burning lubricating oil


    正确答案： B
    解析： 暂无解析

  • 第14题：

    单选题
    On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.
    A

    banjo feed

    B

    splash feed

    C

    gravity feed

    D

    pressure feed


    正确答案： B
    解析： 暂无解析

  • 第15题：

    单选题
    Which of the following will be the function of lubricating oil used in marine engines?（）
    A

    to remove heat from oil cooled pistons

    B

    to wash away wear detritus

    C

    to neutralize acidic products

    D

    all of the above


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    What function is provided by the crankcase ventilation system on some diesel engines?（）
    A

    Increases the sludge forming tendency of lube oil

    B

    Prevents the accumulation of combustible gases

    C

    Improves lube oil cooling

    D

    Improves cold weather starting


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）
    A

    increase the liner area covered by the oil film

    B

    maintain an oil film on the lower liner where scuffing is prevalent

    C

    keep excess oil away from intake and exhaust ports

    D

    help cushion piston skirt side thrust by providing a hydrodynamic oil wedge


    正确答案： C
    解析： 暂无解析

  • 第18题：

    单选题
    If the detergent type lubricating oil being used in a diesel engine is black, the oil （）
    A

    must be centrifuged

    B

    must by filtered

    C

    must be changed

    D

    is holding finely dispersed carbon in suspension


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
    A

    metal particles loosened by wear

    B

    air when no air cleaners are used

    C

    condensation of water vapors

    D

    breakdown of the lubricating oil by dilution


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.
    A

    suppressant additive

    B

    dispersant additive

    C

    extreme pressure additive

    D

    viscosity improver additive


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    Lubricating oil used in a diesel engine serves to（）
    A

    reduce the wear of bearing surfaces

    B

    cool the bearing surfaces

    C

    assist in sealing bearing surfaces

    D

    all of the above


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    How often should the lubricating oil of a diesel engine be changed?（）
    A

    After every trip

    B

    Every 4000 hours

    C

    According to manufacturer’s instructions

    D

    Every time they are shutdown


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    In some modern large diesel engines, which of the following is used as the support for the main bearings?（）
    A

    Bedplate

    B

    Block

    C

    Base

    D

    Sump


    正确答案： D
    解析： 暂无解析

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