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
The highest pressure in any closed diesel engine freshwater cooling system is at the （）.
A
jacket water outlet
B
expansion tank inlet
C
heat exchanger inlet
D
cooling water pump outlet
参考解析
解析：
暂无解析
相关考题：
The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.A.determine the need for filter cleaningB.measure any change in oil viscosityC.prevent damage to the filterD.determine the need for batch filtration
Any increase in the exhaust back pressure of a four-stroke/cycle diesel enginewill( ).A.reduce engine horsepower outputB.aid in silencing the exhaust noiseC.increase the mean effective pressureD.contribute to effective cylinder scavenging
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
单选题A marine diesel engine is started by（）Asupplying high pressure oil into a hydraulic motorBsupplying high temperature air into the cylinderCsupplying high pressure air into the cylinderDelectrical igniting
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 diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）Aprevent engine back pressure at heavy loadsBincrease total engine efficiency at low loadsCprevent boiler corrosion at low engine loadsDimprove engine fuel consumption at any load
单选题Excessive diesel engine back pressure may be an indication of （）Acarbon buildup in the exhaust manifoldBovercooling of the exhaust manifoldCeroded muffler baffle platesDhigh injection pressure
单选题The highest loads applied to the diesel engine crankshaft main bearings are （）Aaxial loadsBfiring loadsCinertia loadsDcentripetal loads
单选题Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）AExhaust temperatureBLube oil levelCLube oil pressureDWater level in the expansion tank
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 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Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）Abearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedBbearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedCthe maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineDtwo-stoke/cycle diesel engines require more complicated lubrication piping
单选题A turbocharged diesel engine will have an intake manifold pressure（）Aconstantly decreasing as engine load increaseBconstantly increasing as the amount of supercharging increasesCapproximately equal to exhaust manifold pressure at all timesDapproximately equal to atmospheric pressure at all times
单选题What does a pyrometer measure on a diesel engine? （）AWater temperatureBWater pressureCExhaust temperatureDAir box pressure
单选题The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.Aair bottleBair compressorCcrank caseDcombustion chamber
单选题A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）Aslightly less than atmospheric pressureBapproximately equal to exhaust manifold pressure at all timesCthat is widely fluctuating constantlyDdecreasing as engine load increases
单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.Areduce engine horsepower outputBaid in silencing the exhaust noiseCincrease the mean effective pressureDcontribute to effective cylinder scavenging
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The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）Adetermine the need for filter cleaningBmeasure any change in oil viscosityCprevent damage to the filterDdetermine the need for batch filtration
单选题The most common instrument used to measure diesel engine exhaust pressure is the （）ApyrometerBbourdon gaugeCpneumercatorDmanometer
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Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.AcompressionBmaximumCratedDoil
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The highest pressure in a diesel engine cylinder normally occurs （）.Aat TDCBbefore TDCCafter TDCDduring air starting
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The intake ports of a two-strike/cycle diesel engine are opened and closed by the action of the （）AcamshaftBpiston movementCexhaust valvesDvertical drive