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Generally speaking, the fuel injected into a marine diesel engine combustion chamber is ignited by ______.
A.spark plugs
B.glow plugs
C.heat of compression
D.a magneto
参考答案
更多 “ Generally speaking, the fuel injected into a marine diesel engine combustion chamber is ignited by ______.A.spark plugsB.glow plugsC.heat of compressionD.a magneto ” 相关考题
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Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.A.prolong the ignition delay periodB.ensure the beginning of fuel injectionC.thoroughly utilize the air chargeD.allow controlled fuel combustion
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When fuel is injected late into a diesel engine cylinder_______.A.the exhaust will be clearB.fuel consumption will be lowC.all the fuel will be burned at top dead centerD.fuel consumption will be high
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单选题The starting of a marine diesel engine is generally carried out with the assistance of （）.A
compressed airB
electricityC
hydraulic oilD
compressing air
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单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）A
quantity of fuel injected is decreasedB
quantity of fuel injected will always be increasedC
start of injection is advancedD
duration of injection will always be greater
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单选题Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.A
spark plugsB
glow plugsC
heat of compressionD
a magneto
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单选题A leaking diesel engine fuel injector will cause（）A
prolonged maintenance intervalsB
improved atomizationC
greater fuel economyD
incomplete combustion
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单选题In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）A
injection lagB
ignition delayC
compressionD
turbulence lag
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单选题Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.A
a shortened ignition delay periodB
a lean fuel/air mixtureC
excess fuel in the combustion chamberD
rapid vaporization of injected fuel droplets
考题
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?（）A
Quantity of fuel injected tends to be decreasedB
Quantity of fuel injected will always be increasedC
Start of injection tends to be advancedD
Duration of injection will always greater
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单选题A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.A
double-acting engineB
opposed pistons engineC
single-acting engineD
horizontal acting engine
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单选题When fuel is injected late into a diesel engine cylinder,（）.A
the exhaust will be clearB
fuel consumption will be lowC
all the fuel will be burned at top dead centerD
fuel consumption will be high
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单选题Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.A
decreased fuel consumption per brake horsepowerB
more complete cylinder scavengingC
extended valve lifeD
carbon formation on combustion chamber surfaces
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单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.A
engine overloadB
low combustion temperatureC
plugged fuel nozzle holesD
excessive compression pressure
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单选题In a marine diesel engine the oil sump is （）.A
just below the crankcaseB
the oil cup for the exhaust valveC
the pan for collecting drain fuel oilD
oil circulating pump
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单选题The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.A
delivering the same quantity of fuel to each cylinder for each power stroke according to engine loadB
maintaining the metering adjustment for a reasonable period under all load conditionsC
timing fuel injection to obtain maximum power and good fuel economyD
distributing the fuel to all parts of the combustion chamber for proper combustion
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单选题Proper atomization of fuel in diesel engine combustion chambers will （）.A
affect the injection pressureB
improve combustionC
reduce compression pressureD
decrease power output
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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 （）.A
air bottleB
air compressorC
crank caseD
combustion chamber
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单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.A
the size of the holes in the fuel nozzleB
timing of the pumpC
supply pressure to the pumpD
shape of the combustion chamber
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单选题The longer the ignition delay period occurs in a diesel engine, the （）.A
less fuel will enter the cylinderB
lower will be cylinder compression temperaturesC
more complete will be fuel combustionD
more rapid will be the rise in combustion pressure
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单选题Combustion knock occurring in a diesel engine can be caused by （）.A
excessive fuel penetrationB
prolonged injection lagC
reduced ignition lagD
prolonged ignition lag
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单选题In the cylinder of a diesel engine fuel is ignited by the（）A
spark from a plug in the pre-combustion chamberB
electrical discharge from the distributorC
heat of compression within the cylinderD
heat from the fuel injection nozzle
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单选题Sludge formation in a diesel engine lube oil system is caused by（）A
carbonization of oils from the combustion chambersB
emulsions of lube oil and waterC
coagulation of unburned fuel below the piston ringsD
all of the above
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单选题One of function of diesel engine lubricating oil is to （）A
induce carbon formation on cylinder wallsB
improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
lubricate the fuel injection
考题
单选题Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）A
prolong the ignition delay periodB
ensure the beginning of fuel injectionC
thoroughly utilize the air chargeD
allow controlled fuel combustion
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单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）A
increase engine powerB
increase engine loadC
decrease engine powerD
improve fuel economy
考题
单选题When fuel is injected in a diesel engine cylinder too early, （）A
ignition may be delayedB
fuel economy is not affectedC
exhaust gas temperature will be unchangedD
the exhaust will be clear
考题
单选题Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）A
injection pressureB
shape of combustion spaceC
turbulence in combustion spaceD
all of the above
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