单选题Diesel engine air start valve timing is controlled by()Aengine operating speedBan air manifoldCa hydraulic distributorDindividual cams and valve gear
单选题
Diesel engine air start valve timing is controlled by()
A
engine operating speed
B
an air manifold
C
a hydraulic distributor
D
individual cams and valve gear
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
If the engine does not start on air, it may be due toA.low compression of the fuel pumpsB.incorrect timing of fuel pumpsC.the starting air valves stuckD.air-locks in fuel oil pipeline
A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct
_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.A.An air receiverB.An operating valveC.An automatic valveD.An air distributor
In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A.Noise coming from that air starting valveB.Continuous operation of the starting air compressorC.Zero air pressure in the air starting systemD.Overheated starting air pipe to the cylinder head
If the engine does start on air, but combustion does not immediately begin, the cause may be _____.A.failure of the fuel pumpsB.starting air pressure too lowC.stop valve in air line closedD.the turning gear still engaged
单选题Which of the following may lead to the engine NOT to start on air?()Astarting air pressure too highBcorrect timing of starting air valvesCthree of the six starting valves stuckDthe turning gear disengaged
单选题If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an ()Aexcessively late injection timing for each cylinderBincorrectly adjusted intake valve timingCincorrectly adjusted fuel injectorDincorrectly adjusted intake valve clearance
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?()AHolding the valve open for a long periodBIncreasing the starting air pressure usedCOpening the stating air valve quicklyDReducing the starting air valve size
单选题If you are unable to stop a diesel engine by any other means,you should().Adischarge a CO2 extinguisher in the air inletBpull off the distributor capCsecure the jacket waterDsecure the starting air supply valve
单选题When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the()Astarting air pressureBscavenge air pressureCover-speed tripDbanjo oiler line
单选题Which of the following may cause that an engine doesnt run on starting air?()Atoo low starting air pressureBmain start valve closedCneither A nor BDA and B
单选题Diesel engine air start system check valves are opened by ()Aan air start camBcylinder compression pressureCstarting air pressureDvalve springs
单选题In the starting system, the automatic valve is controlled by(), and the cylinder start valves are controlled by()Apilot air;pilot airBhandle;solenoidChandle;pilot air coming through the distributorDsolenoid;pilot air coming through the distributor
单选题() in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.ABecauseBOwing toCForDNo matter
单选题() is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.AAn air receiverBAn operating valveCAn automatic valveDAn air distributor
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The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?()Aspeed, torque, and horsepower productionBfiring order, valve timing, and valve liftCfuel consumption, efficiency, and cylinder pressureDscavenge pressure, compression ratio, and exhaust pressure
单选题A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must ()Aline up the engine fore restarting with light diesel oilBreposition the fuel injection camCchange the intake and exhaust valve cam positionsDplace the starting cam in the intermediate position
单选题If the engine does not start on air, it may be due to ()Alow compression of the fuel pumpsBincorrect timing of fuel pumpsCthe starting air valves stuckDair-locks in fuel oil pipeline
单选题If the engine does start on air, but combustion does not immediately begin, the cause may be ().Afailure of the fuel pumpsBstarting air pressure too lowCstop valve in air line closedDthe turning gear still engaged
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?()Anoise coming from that air starting valveBcontinuous operation of the starting air compressorCzero air pressure in the air starting systemDoverheated starting air pipe to the cylinder head
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The timing of diesel engine air starting valves is controlled by()Athe air start valve timing gears and rodsBa cylinder check valveCindividual cams and valve gearDan air manifold poppet valve
单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()Aregulating the level of corrosion inhibitor in the primary cooling systemBthe level of the freshwater expansion tankCvarying the engine load to meet temperature requirementsDthe operation of the thermostatic valve
单选题Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in ()Aan air bound fuel systemBdamage to cylinder heads and pistonsCexcessive fuel injectionDexcessive air valve lift