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 any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.
A
jacket water outlet
B
cooling water pump outlet
C
heat exchanger outlet
D
expansion tank atmospheric vent
参考解析
解析：
暂无解析
相关考题：
If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).A.a broken shaft on the freshwater pumpB.an excessive accumulation of scale in the heat exchangerC.an incorrect thermostatic element operating rangeD.lube oil in the cooling water
In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.A.suction pressure regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank
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
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 pH value of water in a diesel engine closed cooling water system should be maintained between （）.A60 to75B80 to 95C100 to 115D120 to 135
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 expansion tank in a diesel engine closed freshwater cooling system is located at （）Athe highest point in the systemBthe lowest point in the systemCnear the floorDplate level or near the tank top level
单选题Before starting any diesel or gasoline engine，which of the following must be checked? （）AOil levelBFlow of cooling waterCExhaust dischargeDAll of the above
单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.Acylinder head water outlet headerBcylinder jacket inlet mainCheat exchanger inlet connectionDjacket water pump suction line
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In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）Aincreased engine back pressureBsulfuric acid corrosionCsurface pitting of the turbochargerDmoisture impingement on the turbocharger compressor blade
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In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.Asuction pressure regulatorBthermostatic bypass valveCsea water temperatureDwater level in the expansion tank
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
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A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in （）Aexcessive time required for warming-upBexcessive freshwater corrosionCscale formation on the saltwater sideDsaltwater mixing with the freshwater
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