单选题The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.AwhyBwhichCin whichDon which
单选题
The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.
A
why
B
which
C
in which
D
on which
参考解析
解析：
暂无解析
相关考题：
If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.A.backfire through the air intakesB.develop less power under loadC.have high firing pressuresD.lift its cylinder relief valves
The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually______.A.greater than the average exhaust manifold pressureB.less than the average exhaust manifold pressureC.greater at the turbine wheel than at the impellerD.greater at reduced engine speed
What is an advantage of diesel over steam turbine propulsion ________．A.Less fuel consumption per SHPB.Diesel fuel costs less than bunker C or its equivalentC.Less routine maintenance requiredD.Less weight per SHP
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Problems with the diesel engine fuel injection pump are usually caused by（）Aimproper adjustmentBcontaminated fuelCkinked fuel linesDexcessive engine vibration
单选题If the engine can be started and maneuvered on high viscosity fuel, the （）of the fuel reaching the injectors should be raised to such a point that the viscosity is less than the required value, ie27c St.ApressureBtemperatureCviscosityDdensity
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Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）Aincreasing the quantity of starting airBincreasing the lube oil pressureCheating the engine fuel supplyDheating the engine coolant
单选题Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.Adecreased fuel consumption per brake horsepowerBmore complete cylinder scavengingCextended valve lifeDcarbon formation on combustion chamber surfaces
单选题Diesel engines are considered safer than gasoline engines because（）.Athey are more heavily builtBthe fuel used is less volatileCthey can be easily reversedDthey operate at a lower speed
单选题What is an advantage of diesel over steam turbine propulsion? （）ALess fuel consumption per SHPBDiesel fuel costs less than bunker C or its equivalentCLess routine maintenance requiredDLess weight per SHP
单选题Worn diesel engine intake valve guides can result in （）Aincreased engine breathing efficiencyBexcessive valve lashCexcessive lube oil consumptionDlower than normal fuel consumption
单选题To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.Areduce the engine driven fuel pump outlet pressureBretard the fuel injector timing to reduce powerCincrease the fuel rack settingDreduce the load on the engine
单选题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.Acompression pressures are below normalBlube oil is diluted with fuel oilCcranking speed is too lowDexhaust system is partially restricted
单选题Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）ALeaking fuel injectorsBLower than normal compressionCDelayed fuel injectionDAll of the above are correct
单选题If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）Abackfire through the air intakesBdevelop less power under loadChave high firing pressuresDlift its cylinder relief valves
单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）Asea water temperature must never be warmer than 40℃Bjacket water pressure should always be greater than the sea water pressureCjacket water temperature must always be less than 60℃Djacket water pressure must always be less than the sea water pressure
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A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）Ahas little or no internal frictionBhas a lower effective compression ratioCoperates with scavenge air under a positive pressureDoperates without energy absorbing intake and exhaust strokes
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Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）Aincrease engine powerBincrease engine loadCdecrease engine powerDimprove fuel economy
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Higher than normal temperature air passing through the intake of a diesel engine will result in（）Agreater overall efficiencyBgreater fuel economyClower horsepowerDlower compression ratio
单选题A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.Aas much fuel asBless fuel thanCless fuel asDmore fuel than
单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）Amaintain higher than normal jacket water temperatureBchange the lube oil more frequently than normalCmaintain a higher air-box temperature than normalDmaintain a higher air-box pressure than normal
单选题Turbulence in a diesel engine cylinder is of major importance in providing （）.Aproper fuel meteringBcomplete fuel/air mixingCminimal fuel penetrationDproper fuel timing
单选题How does the engine adjust itself to different formulas of fuel?ABy piping in more oxygen for ethanol.BBy sensing the amount of oxygen in a car’s exhaust.CBy burning in a less-than-optimal mode.DBy stopping and checking the fuel tank.