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
Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.
A
reduce engine horsepower output
B
aid in silencing the exhaust noise
C
increase the mean effective pressure
D
contribute to effective cylinder scavenging
参考解析
解析：
暂无解析
相关考题：
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
During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ______.A.effective cylinder scavenging and coolingB.constant pressure from the turbochargersC.cooler operation of the exhaust systemD.effective constant pressure for turbocharger operation
单选题For an ordinary four-stroke engine the exhaust valves open （）.Aafter TDCBbefore TDCCafter BDCDbefore BDC
单选题Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）AWorn intake valve guidesBPitted pre-combustion chambersCLoose valve tappetsDHigh exhaust back pressure
单选题Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）Aan increase in the exhaust temperature of the affected cylinderBthe turbocharger may surgeCthe explosion pressure in all cylinders will rise violentlyDsmoke from the turbocharger air inlet filter will be seen
单选题Late fuel injection timing is indicated by （）Alower than normal cylinder pressure and low exhaust temperatureBlower than normal cylinder pressure and high exhaust temperatureChigher than normal cylinder pressure and low exhaust temperatureDhigher than normal cylinder pressure and high exhaust temperature
单选题Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）AConstant volumeBConstant pressureCPulse pressureDRadial flow
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Diesel engine exhaust noise can be reduced in an exhaust muffler by （）Achanging the direction of exhaust gas flowBincreasing the exhaust gas velocityCchanging the exhaust gas weightDincreasing the exhaust gas static pressure
单选题What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）ARapid increase in temperature with constant pressureBRapid increase in pressure with constant temperatureCRapid increase in pressure and temperatureDRapid increase in volume and decrease in pressure
单选题Which of the following condition is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?（）AIndicated exhaust pressure readings will increaseBPyrometer responses will be retardedCIndicated cylinder temperature readings will increaseDIndicated firing pressure readings will increase
单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）ALow compression pressure and high exhaust temperatureBLow firing pressure and high exhaust temperatureCLow compression pressure and low exhaust temperatureDLow firing pressure and low exhaust temperature
单选题High exhaust back pressure will result in an increase in （）Aturbocharger efficiencyBengine power outputCcarbon deposits on fuel injectorsDcylinder scavenging
单选题During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）Aeffective cylinder scavenging and coolingBconstant pressure from the turbochargersCcooler operation of the exhaust systemDeffective constant pressure for turbocharger operation
单选题Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）Aincrease back pressure during the exhaust processBfacilitate periodic replacement of the valvesCreduce the pumping loss associated with scavengingDreduce tension on valve springs
单选题Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pistons
单选题If a diesel engine is smoking excessively under load, the cause could be （）Alow exhaust back pressureBearly fuel injection in one of the cylindersCcompression pressure in one of the cylindersDplugged injector holes
单选题Which of the listed set of conditions indicates early fuel injection timing?（）ALoss of engine power and high exhaust temperaturesBHigher than normal firing pressure and low exhaust temperaturesCHigh fuel consumption and high exhaust temperaturesDLower than normal compression pressure and high exhaust temperature
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An automated diesel engine should normally shut down due to （）Alow lube oil temperatureBhigh ambient air temperatureClow tube oil pressureDhigh exhaust system back pressure
单选题Low compression pressure in a diesel engine may be the result of （）Ainsufficient fuel supply due to fuel pump valves sticking or leakingBexcessive mechanical clearance between the piston crown and cylinder headCexcessively worn fuel pump plungerDexcessive exhaust back pressure
单选题Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）AAt zero load the intake manifold pressure is greater than the exhaust manifold pressureBAt full load the intake manifold pressure and exhaust manifold pressure are equalCAt full load the intake manifold pressure is less than the exhaust manifold pressureDAt full load the intake manifold pressure is greater than the exhaust manifold pressure
单选题An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.Adecrease in maximum cylinder pressureBincrease in ignition lagCdecrease in fuel consumption per horsepower-hourDdecrease in exhaust manifold pressure
单选题An indication of a diesel engine air intake being partially clogged, is （）.Alow firing pressure and low exhaust temperaturesBlow firing pressure and normal exhaust temperaturesChigh firing pressure and low exhaust temperaturesDhigh firing pressure and high exhaust temperatures
单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）AAdvanced ignitionBClogged air intakeCLeaky exhaust valveDHigh exhaust pressure
单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.Atemperature of the exhaust gasesBenergy supplied to the turbochargerCair pressure to the intake manifoldDpurge of exhausted gases from the cylinders
单选题Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pistons