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单选题
The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.
A
metering
B
timing
C
rate of injection
D
rate of distribution
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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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Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily byA.heat conduction into the injected fuel oilB.heat conduction into the water jacket wallC.water circulation through passages in the holderD.fuel oil circulation through passages m the holder
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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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When the fuel oil is burning in the combustion chamber, it _____.A.gives up large amount of heatB.gives off large amount of heatC.gives up large amount of steamD.gives off large amount of steam
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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When the fuel oil is burning in the combustion chamber, it （）.A
gives up large amount of heatB
gives off large amount of heatC
gives up large amount of steamD
gives off large amount of steam
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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On most diesel engines, the governor controls the output speed by （）.A
controlling the amount of fuel injected into the cylindersB
varying the speed of the turbochargerC
adjusting the compression ratioD
changing the timing of the fuel injection camshaft
考题
单选题If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）A
valve will open laterB
valves will close laterC
amount of fuel injected will be increasedD
amount of fuel injected will be decreased
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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
考题
单选题Fuel has to be injected into the engine at a high pressure so that it （） correctly.A
is purifiedB
in timedC
is compressedD
atomizes
考题
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The ignition quality of a fuel oil is an important operational consideration because it（）A
indicates the amount of abrasive material in the fuelB
affects the starting ability of a cold engineC
determines the amount of fuel penetration engineD
affects the compression ratio of an operating engine
考题
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?（）A
The amount of fuel injected will be increasedB
The start of injection will be retardedC
The nozzle will permit fuel to dribbleD
The spray pattern will be distorted
考题
单选题Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.A
heat conduction into the injected fuel oilB
heat conduction into the water jacket wallC
water circulation through passages in the holderD
fuel oil circulation through passages in the holder
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单选题The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.A
quantity of fuel to be receivedB
flash point of the fuel as it is receivedC
fuel temperature as it is receivedD
viscosity of the fuel being received
考题
单选题（） into the cylinder because no fuel can burn （） it.A
Air must be admitted；withoutB
Oil must be injected；withoutC
Air must be admitted；withD
Oil must be injected；with
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单选题The notice of casualty to a ship must include（）.A
a request for assistanceB
the location of the unit at the time of the casualtyC
an estimate of the cost to repair damagesD
the amount of fuel remaining
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 injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
考题
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Fuel has been injected but ignition fails The possible cause may be （）.A
leaky exhaust valveB
increased scavenging air temperatureC
engine cylinders not scavenged sufficientlyD
water in the fuel oil
考题
单选题In a common rail engine, the fuel is injected into cylinders（）A
by injection pumpsB
at a time decided by the injection pump timingC
by a signal opening the magnetic valvesD
at a time decided by the cam directly
考题
单选题It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.A
inlet portB
exhaust portC
spill portD
scavenge port
考题
单选题In common rail engines, the fuel is（） before is injected into the cylinders.A
stored in a common fuel lineB
pumped by the injection pumpC
at low pressureD
already atomized
考题
单选题When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）A
the starting air supply is cut off and fuel is injected into the cylindersB
the fuel feeding is cut off and the turning gear is put inC
the starting air supply is cut off and turning gear is taken outD
the electric blower is shut down and fuel is injected into the cylinders
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