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 waterB.Reduces the capability of the lubrication systemC.Can form pockets which block the flow of coolant through the systemD.Leads to the scuffing of cylinder walls
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
相关考题：
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
单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should（）Astop the engine immediately to prevent damageBincrease lube oil pressureCslow the engine allowing it to gradually coolDdecrease the cooling water it temperature to the water jacket
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 operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）Aa low level in the engine expansion tankBexcessively high coolant pressureCimproper temperaturesDmalfunctioning of the jacket water heater
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The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.Acauses colloid suspension in the cooling waterBreduces the capability of the lubrication systemCcan form pockets which block the flow of coolant through the systemDleads to the scuffing of cylinder walls
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 a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）Aimproper venting of the cooling systemBcarrying the expansion tank water level too highCa totally clogged impeller in the cooling water pumpDan incorrectly set cooling system temperature control
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The highest pressure in any closed diesel engine freshwater cooling system is at the （）.Ajacket water outletBexpansion tank inletCheat exchanger inletDcooling water pump outlet
单选题Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）Acylinder head cracksBpiping jointsCpump leakingDall of the above
单选题Cold weather starting of a diesel engine may be made easier by（）Adecreasing the compression ratioBusing a special fuel having a high ignition temperatureCincreasing the starting air supplyDheating the jacket water
单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）Araw water pump dischargeBexpansion tank outletCcooling water heat exchangerDoutlet engine jacket water outlet
单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.Aloss of suction in the circulating pumpBleak in the primary cooling systemCbroken raw water pump shaftDburned or cracked piston in one cylinder
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Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）AExcessive piston blow-by to the manifoldBInsufficient cooling water flowCAccumulated water in the air boxesDClogged air intake filters
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A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.Aslight acidityBslight alkalinityCexcessive alkalinityDexcessive acidity
单选题In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.Ajacket water outletBcooling water pump outletCheat exchanger outletDexpansion tank atmospheric vent
单选题In a diesel engine cooling water system, a pH of 60 indicates a/an （）.Aslightly acidic conditionBslightly alkaline conditionCovertreatment of waterDneutral condition of water
单选题There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.Aa setting tankBa service tankCa head tankDan expansion joint
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Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）ALow cooling water outlet temperatureBHigh lube oil pressureCLow lube oil temperatureDLow starting air pressure