单选题（） the supercharge pressure is, （） power an engine develops.AThe higher；the moreBHigher；moreCHigher；littleDThe higher；the less
单选题
（） the supercharge pressure is, （） power an engine develops.
A
The higher；the more
B
Higher；more
C
Higher；little
D
The higher；the less
参考解析
解析：
暂无解析
相关考题：
材料：A typical example of a hydraulic governor is the Woodward. This has adjustable droop for parallel operation and it is fitted with a speed-adjusting control . If required it can be fitted with a synchronizing motor to provide remote control from a switchboard.A gear pump driven from the engine supplies oil under pressure to accumulator pistons under which is a by-pass to regulate maximum pressure. One branch supplies oil which acts on top of the power piston, the pressure always tending to turn the terminal shaft to shut off fuel, while the other branch supplies oil to the pilot valve which is operated by the linkage from the fly weights above.Should the speed of the engine decrease due to increased load the flyweights will move towards their center of rotation and lower the position of the pilot valve plunger, admitting oil pressure from the bottom of the power piston. Since, however, the area on the bottom is much greater than the top the net resultant force causes the piston to move upwards. This operates the power lever turning the terminal shaft which varies the cut-off point in the fuel pump through linkage, but as the power piston moves up, the actuating compensating piston moves down.Oil under this piston is now forced through the needle valve to the receiving compensating piston, raising the outer end of the floating lever and the pilot valve plunger until it has returned to its normal position. This stops further movement of the terminal shaft so that the fuel control is now set in a position corresponding to the increased fuel required to run the engine at normal speed under the increased load.问题：This passage is mainly about ___.A.what type of governor should be provided when the engine is used for electric power generationB.why the speed of the engine fluctuatesC.how the governor worksD.how the fuel pumps workThe oil from the gear pump will ___. ① be supplied to the accumulator ② act on the power piston ③ be supplied to the pilot valveA.①B.①②C.②③D.①②③Which of the following is true about the Woodward discussed?A.It is a kind of mechanical governor.B.It can not be used for parallel operation.C.It has speed droop.D.It may only be manually controlled from a switch boarE.When the speed of the engine decreases due to increased load, which of the following will NOT happen?A.The flyweights move towards their centerB.The pilot valve plunger moves towards its normal positionC.The power piston moves downwards until it returns to its normal positionD.The terminal shaft moves to a new position请帮忙给出每个问题的正确答案和分析，谢谢！
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（） power is the power developed within the cylinder and can be measured by an engine indicator.AThe shaftBThe mechanicalCThe electricDThe indicated
单选题As a heat engine,（） energy is the source of power by which the diesel engine can be operated.AelectricBheatCmechanicalDexhaust
单选题An indicator card or pressure-volume diagram, shows graphically the （）Acompression ratio of the engineBvolume of the engineCrelationships between pressure and volume during one stroke of the engineDrelationships between pressure and volume during one cycle of the engine
单选题A supercharged engine differs from an un-supercharged engine it operates at an increases pressure（）.Ain whichBon whichCat whichDin that
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If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）Atoo lowBa little lowerCa little higherDexactly the same
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With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.Aincrease the exhaust temperatureBincrease the power ofCreduce the speedDincrease the fuel consumption
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In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.Afluctuates with the engine speed to some extent, independent of the engine speedBkeeps constant at all engine speed, dependent on the engine speed to some extentCkeeps constant at all engine speed, independent of the engine speedDis decided by the engine speed, constant at all engine speed
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（） the supercharge pressure is, （） power an engine develops.AThe higher；the moreBHigher；moreCHigher；littleDThe higher；the less
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Significant retardation of a diesel engine fuel injection timing will result in （）Asmoother engine operationBadvanced fuel ignitionCincreased fuel economyDreduced engine power
单选题Which statement about diesel engine combustion is true?（）ACombustion does not begin until the piston starts down on the power strokeBMaximum combustion pressure is reached before TDCCTurbulence in the cylinder causes a delay in ignitionDMaximum cylinder firing pressure is not developed until the piston passes TDC
单选题A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）Afuel droplets will burn as they leave the fuel injectorBfuel will not be properly atomized in the cylinderCmaximum expansion of the burned fuel cannot take place in the cylinderDcompression pressure will be too low to cause fuel ignition
单选题For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.Ait has a longer power strokeBmore air gets into the cylinder each strokeCit develops twice as many power strokes at the same speedDhigher combustion pressure is developed
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.AA common rail engine；conventional enginesBA conventional engine；common rail enginesCA marine diesel engine；most other enginesDA two-stroke engine；four-stroke engines
单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）AThe coolant temperature must be maintained at 180℃BThe thermostatic bypass valves must be manually opened before the engine is startedCThe pressure cap must be removed while the engine is securedDElectrical power to the heater must be secured before the cooling system is drained
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The average pressure exerted on piston during each power stroke is termed（）Aindicated horsepowerBmean effective pressureCexhaust back pressureDcompression pressure