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 naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）
A
slightly less than atmospheric pressure
B
approximately equal to exhaust manifold pressure at all times
C
that is widely fluctuating constantly
D
decreasing as engine load increases
参考解析
解析：
暂无解析
相关考题：
My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern. This sentence ______.A.indicates the engine’s particularsB.tells the engine’s functionC.shows the engine’s typeD.refers to the engine’s information
Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?A.Ignition lag increases.B.Lube oil system pressure increases.C.Brake specific fuel consumption increases.D.Mechanical efficiency increases.
单选题The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.AprincipleBprincipalCcauseDcase
单选题Diesel oil may be used to cool （） of a diesel engine.AcylindersBexhaust valvesCpistonsDfuel valves
单选题A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）Aignition lagBengine horsepowerClube oil system pressureDspecific fuel consumption
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The size of the exhaust valve opening is （）Amost critical in a four-stroke cycle diesel engineBmost critical in a two-stroke/cycle diesel engineCmost critical in a four-stroke/cycle diesel engine if it is turbochargedDof equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
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What is the effect of heated intake air on a diesel engine? （）AIncreases efficiencyBIncreases engine horsepowerCIncreases engine lifeDReduces engine horsepower
单选题If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.Aopen air-box drainsBloss of cooling water to the diffuserCgradual fouling of the air filtersDimproperly timed exhaust valves
单选题Under which of the listed conditions can the engine room retake the throttle control from the bridge（）.AAny time it is deemed necessaryBOnly with the masters permissionCAfter a 10 minute delay to the input commandDOnly after the throttle has been placed in stop
单选题Maximum horsepower of a diesel engine is attained （）.Awhen the engine RPM is pulled down by overloadBat rated engine RPMCat 95 % of rated engine RPMDat 95 % of a properly adjusted governor RPM with the engine under full load
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One cause of diesel engine surging can be a result of （）Ainjection pump plungers stuck or wornBlow compressionCsolenoid stuck openDfuel tank too full
单选题In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.Acompression ratioBvalve sizeCfuel pressureDcylinder clearance volume
单选题Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）AIncreased turbulenceBincreased mechanical efficiencyCIncreased brake mean effective pressureDAll of the above
单选题Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）AIgnition lag increasesBLube oil system pressure increasesCBrake specific fuel consumption increasedDMechanical efficiency increaded
单选题My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern. This sentence（）.Aindicates the engine's particularsBtells the engine's functionCshows the engine's typeDrefers to the engine's information
单选题A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）Atorque limiterBover-speed tripCover-speed governorDload limit governor
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The diesel engine is a type of （）.Aturbine engineBgas turbineCsteam engineDinternal combustion engine
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）Aa modern diesel engine；a turbine wheelBa modem diesel engine；exhaust gasesCa compressor；an exhaust gas turbochargerDa compressor；a turbine wheel
单选题If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.Aopen；short；afterBclosed；short；afterCopen；long；beforeDclosed；long；before
单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）Aa cylinder air charge of higher pressureBincreased pumping lossesCless valve overlapDreduced blow-by
单选题When ship navigating in rough sea, the correct operation is （）Anavigating with a low diesel engine speedBnavigating with a stable diesel engine speedCincreasing the efficiency of propellerDincreasing fuel injection
单选题On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.Aone engine ahead and one engine astern，with full rudderBone engine ahead and one engine astern，with rudders amidshipsCboth engines ahead，with full rudderDboth engines astern，with full rudder