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
If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）
A
too low
B
a little lower
C
a little higher
D
exactly the same
参考解析
解析：
暂无解析
相关考题：
A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.A.engine overloadB.leaky valvesC.stuck or broken piston ringsD.low air injection pressure
If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because theA.cylinder compression pressure may not be high enoughB.cylinder compression temperature may be too highC.fuel oil injection pressure may not be high enoughD.scavenge and purge process is incomplete
While sailing in ballast under normal weather and sea condition, the basic parameter which is used to restrict the fuel injection of main engine isA.the exhaust temperatureB.the speed of main engineC.the turbine rotation speedD.the power of main engine
单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）Aquantity of fuel injected is decreasedBquantity of fuel injected will always be increasedCstart of injection is advancedDduration of injection will always be greater
单选题If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.Aa little lowerBa little higherCtoo lowDexactly the same
单选题A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）Aengine overloadBleaky valvesCstuck or broken piston ringsDlow air injection pressure
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 knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.Acaused by retarded injection timingBcaused by a mechanical defect in one cylinderCcaused by high fuel injection pressuresDnormal for these conditions
单选题When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）Ato work as overload characteristicBoverspeedCover mechanical load onlyDover thermal load only
单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）AQuantity of fuel injected tends to be decreasedBQuantity of fuel injected will always be increasedCStart of injection tends to be advancedDDuration of injection will always greater
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The high pressure in fuel injection system of the diesel engine is produced by the （）.Ainjector pumpBfuel injectorCgovernorDturbocharger
单选题If a diesel engine turned over at normal cranking speed but failed to start, the cause could be late fuel injection or （）Aexcessive fuel pressureBhigh lube oil viscosityCinadequate fuel injectionDexcessive starting air pressure
单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.Athe size of the holes in the fuel nozzleBtiming of the pumpCsupply pressure to the pumpDshape of the combustion chamber
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If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.Acylinder compression pressure may not be high enoughBcylinder compression temperature may be too highCfuel oil injection pressure may not be high enoughDscavenge and purge process is incomplete
单选题Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）AThe amount of fuel injected will be increasedBThe start of injection will be retardedCThe nozzle will permit fuel to dribbleDThe spray pattern will be distorted
单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）Aearly injection timingBworn orifices in the injection nozzlesCworn or scored cylinder linersDusing a fuel with too low of a cetane number
单选题A fuel injection valve opening at pressure lower than normal will result in（）.Alate fuel injectionBearly fuel injectionChigh exhaust temperature from that cylinderDdecreased effective stroke from that injector
单选题Early fuel injection timing is indicated by the cylinder pressure being（）Aabove normal with a below normal exhaust temperatureBabove normal with a normal exhaust temperatureCbelow normal with a normal exhaust temperatureDbelow normal with an above normal exhaust temperature
单选题Late fuel injection in a diesel engine is indicated by low firing pressure with （）Alow exhaust temperatureBlow exhaust pressureCmechanical knock in each cylinderDblack or gray exhaust smoke
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A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.Acan’t be controlled very preciselyBcan’t be controlled as flexibly as the separate pump systemCcan be controlled as flexibly as the separate pump systemDcan be controlled more precisely and flexibly
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）Aincrease the starting air pressureBuse a higher than normal cranking speedCincrease the fuel injection pressureDuse a fuel having a lower ignition temperature
单选题The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）Adegree of cylinder air turbulenceBfiring pressure in the engineCquality of fuel to be injectedDduration of the ignition delay period
单选题Misfiring in a diesel engine at light loads can be caused by（）Ahigh lube oil temperatureBlow lube oil temperatureCexcessive cylinder coolingDhigh air injection pressure