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?()AFlash point improversBPour point improversCInhibitorsDFoam suppressors

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


参考解析

解析: 暂无解析

相关考题:

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

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

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

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 filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge

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)

单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by ()Awater in the fuelBinsufficient fuel for combustionCclogged air intake passagesDburning lubricating oil

单选题For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by ()Amoving the governor control to stopBshutting off the lubricating oil supplyCtripping the governor emergency stop leverDshutting off the fuel supply

单选题Excessive lubricating oil consumption in a running diesel engine can be caused by ()Aclogged lube oil pipingBexcessive valve-guide clearanceChigh lube oil viscosityDlow lube oil temperature

单选题On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by ().Abanjo feedBsplash feedCgravity feedDpressure feed

单选题Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the()Acooling water leaving each cylinderBfuel oil entering the injectorCexhaust gases at various locationsDlube oil at the bearing supplies

单选题Which of the following will be the function of lubricating oil used in marine engines?()Ato remove heat from oil cooled pistonsBto wash away wear detritusCto neutralize acidic productsDall of the above

单选题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of ().Afuel oil vapor at the sludge tank ventBunburned fuel vapors in the scavenge air receiverClube oil vapors in the crank caseDlube oil vapors in the engine room

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()Aat the beginning of every watchBat the beginning of the first watch every dayCat the completion of every watchDat noon every day

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 ()Aincrease the liner area covered by the oil filmBmaintain an oil film on the lower liner where scuffing is prevalentCkeep excess oil away from intake and exhaust portsDhelp cushion piston skirt side thrust by providing a hydrodynamic oil wedge

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()AfilteringBcentrifugingCdepositingDoperating

单选题If the detergent type lubricating oil being used in a diesel engine is black, the oil ()Amust be centrifugedBmust by filteredCmust be changedDis holding finely dispersed carbon in suspension

单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the ().Ametal particles loosened by wearBair when no air cleaners are usedCcondensation of water vaporsDbreakdown of the lubricating oil by dilution

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?()ALubrication systems using engine driven lube oil pumps do not require any additional independent arrangement when such arrangements have been proven reliableBThe use of engine driven pre-lube pumps is permitted on vessels with propulsion systems developing less than 500 shaft horsepowerCWhen 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 operationDLubrication systems where two oil coolers are fitted require a minimum of two temperature control devices which may be actuated by similar sensors

单选题An additive used to improve the ability of a lube oil to reduce friction is known as a/an ().Asuppressant additiveBdispersant additiveCextreme pressure additiveDviscosity improver additive

单选题An electric heater built into some smaller diesel engines is used to ().Araise lube oil viscosity for easier starting in cold weatherBincrease air inlet temperatureCincrease compression ratioDincrease jacket water temperature for easier starting in cold weather

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

单选题Lubricating oil viscosity in an operating diesel engine can be reduced by()Aincreasing cooling water flowBincreasing lube oil flowCdilution by fuel oilDadding SAE 70 oil

单选题Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?()AElectricBHydraulicCAirDAll of the above

单选题Lubricating oil used in a diesel engine serves to()Areduce the wear of bearing surfacesBcool the bearing surfacesCassist in sealing bearing surfacesDall of the above

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

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?()AFlash point improversBPour point improversCInhibitorsDFoam suppressors

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

单选题Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the ().Amain bearingsBconnecting rod bearingsCpiston pin bushingsDAll of the above