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 corrosionA.I +IIB.II + IIIC.III + IVD.I +IV
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 corrosion
A.I +II
B.II + III
C.III + IV
D.I +IV
相关考题：
The cooling water of the diesel engine should be treated with chemical, because it contains .A.alkaliB.acidityC.salinityD.impurity
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 II III、increase thermal capacity IV、 resist corrosionA.I + IIB.II + IIIC.III + IVD.I + IV
Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?A.Baffle plates that have been bent during prior removalB.Leaks m the cooler tube nestC.Operating the engine while maintaining a high sea water outlet temperatureD.A punctured sea water strainer supplying cooling water to the heat exchanger
网络安全技术主要是研究:安全攻击、安全机制和安全服务,以下I.有损网络安全的操作II.用于检测、预防的机制III.安全攻击恢复机制IV.信息传输安全性哪个(些)是属于安全机制方面的内容() A.I和IIB.II和IIIC.III和IVD.I和IV
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
Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.A.increase power outputB.decrease lube oil viscosityC.eliminate fuel knockD.cause sulfuric acid formation
根据中国海商法规定，海上旅客运输合同中加入哪些条款是无效的：I、免除承运人对旅客应当承担的法定责任 II、降低承运人责任限额 III、对举证责任作出相反规定 IV、限制旅客赔偿请求权A.I~IIB.II~IIIC.III~IVD.I~IV
单选题If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）Aa broken shaft on the freshwater pumpBan excessive accumulation of scale exchangerCan incorrect thermostatic element operating rangeDlube oil in the cooling water
单选题The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.Afresh water expansion tankBsea water expansion tankCthermostatic expansion valveDjacket water cooler accumulator
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Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）ABaffle plates that have been bent during prior removalBLeaks in the cooler tube nestCOperating the engine while maintaining a high sea water outlet temperatureDA punctured sea water strainer supplying cooling water to the heat exchanger
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 cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the （）Aturbocharger will stallBdensity of the air charge will decreaseCscavenge effect will increaseDexhaust pressure will increase
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 statements is correct concerning diesel engine cooling water systems?（）AEach engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationBpropulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinderCAt least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangersDSuitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling
单选题Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.Acooling water pumpBnozzle cooling passagesCcylinder jacketsDheat exchanger
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Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）AAir will enter the cooling systemBCarbon will plug the water cooled exhaust manifoldsCThe jacket water temperature will riseDThe lube oil viscosity will increase
单选题Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.Athe formation of sulfuric acidBa decrease in lube oil viscosityCa decrease in cooling water pHDa thermostat failure