Constant cooling the various components of diesel engine has a number of functions except for ______.A.good lubricationB.low thermal stressC.good mechanical propertiesD.acid corrosion
Constant cooling the various components of diesel engine has a number of functions except for ______.
A.good lubrication
B.low thermal stress
C.good mechanical properties
D.acid corrosion
相关考题：
The cooling water of the diesel engine should be treated with chemical, because it contains .A.alkaliB.acidityC.salinityD.impurity
High diesel engine cooling water temperatures can be caused by ______.A.air in the cooling systemB.an overhauled water pumpC.correct amount of coolantD.no air in the cooling system
The engine has more than 300（ ）,made of a number of different materials.A.compositionsB.ingredientsC.compoundsD.components
单选题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）AImpellerBCompressorCAfter-coolerDExhaust differ
单选题Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）AMaintains a constant head on the systemBReduces the likelihood of air or steam pockets formationCProvides a low pressure point for the addition of makeup cooling waterDAll of the above
单选题It is necessary to （） cool the various components of the machinery so that the engine can work properly.AcontinuouslyBregularlyCconstantlyDperiod
单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）Areduce lube oil temperatureBraise exhaust temperature reduceCexcessive heating of engine roomDreduce load on cooling water pump
单选题The purpose of treating the cooling water of the diesel engine is to（） Ⅰ. resist the scale formation in the cooling chamber Ⅱ.lubricate the engine part Ⅲ.increase thermal capacity Ⅳ.resist corrosionAⅠ+ⅡBⅡ+ⅢCⅢ+ⅣDⅠ+Ⅳ
单选题Why the cooling water of the diesel engine should be treated? Because the（）ACooling water is alkalescenceBcooling water is acidityCcooling water has salinityDcooling water has impurity
单选题Which of the diesel engine cylinder liners listed has internal cooling water passages?（）AInternally finned linerBExternally finned linerCWet linerDIntegral water-jacket liner
单选题If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）Aair binding of the engine cooling systemBa cracked water cooled exhaust manifoldCblockage in the heat exchangerDfaulty operation of the thermostat
单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）Afree entry of air to the crankcaseBwater entering the crankcase while engine wash-downs are being performedCexcessive oil leakage during periods of increased blow-byDsub-cooling internal components
单选题High diesel engine cooling water temperatures can be caused by （）.Aair in the cooling systemBan overhauled water pumpCcorrect amount of coolantDno air in the cooling system
单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.Areduce water temperatureBreduce water turbulenceCprovide an air cushionDallow for an increase in water volume as the engine warms up
单选题A diesel engine is similar to a gasoline engine except that the former has no （）.Across-headBcylinderCconnecting rodDspark plug
单选题Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）Amaintain low pH in the cooling waterBreduce the cooling water temperatureCincrease cooling water hardnessDform a protective film on metal surfaces
单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.Afluctuates with the engine speed to some extent, independent of the engine speedBkeeps constant at all engine speed, dependent on the engine speed to some extentCkeeps constant at all engine speed, independent of the engine speedDis decided by the engine speed, constant at all engine speed
单选题The cooling water of the diesel engine should be treated, because it has（）Aalkale scenceBacidityCsalinityDimpurity
单选题Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）ADefective temperature controls in the systemBCavitation in the cooling water pumpCOpened vent in the cooling systemDRestricted water passages in the engine
单选题If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.Aacidity has increasedBviscosity has decreasedCdemulsibility has improvedDfoaming is guaranteed to occur
单选题If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）Adecrease until the engine speed increasesBincrease as the load increasesCdecrease as the loadDincreases remain unchanged
单选题Diesel engine piston seizure can be caused by （）Apoor cooling of cylinder wallsBimproper cooling of the pistonCinsufficient piston lubricationDall of the above
单选题In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?（）Acooling water of the cooling systemBfuel of the FO systemCLO of the LO systemDcooling water of the cooling system and LO of the LO system
单选题Metal particles accumulated from the wearing of components in a diesel engine can result from lube oil that has been contaminated with（）.Aabrasive particlesBmetallic oxidesCcorrosive acidsDany or all of the above
单选题High diesel engine cooling water temperatures can be caused by （）.Aa worn water pumpBnot enough coolantCair in the cooling systemDall of the above
单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）Aregulating the level of corrosion inhibitor in the primary cooling systemBthe level of the freshwater expansion tankCvarying the engine load to meet temperature requirementsDthe operation of the thermostatic valve
单选题Constant cooling the various components of diesel engine has a number of functions except for （）.Agood lubricationBlow thermal stressCgood mechanical propertiesDacid corrosion