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单选题
If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）
A
too low
B
a little lower
C
a little higher
D
exactly the same
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单选题If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.A
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单选题Late fuel injection timing is indicated by （）A
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单选题The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.A
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单选题When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）A
to work as overload characteristicB
overspeedC
over mechanical load onlyD
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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If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）A
too lowB
a little lowerC
a little higherD
exactly the same
考题
单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
fluctuates with the engine speed to some extent, independent of the engine speedB
keeps constant at all engine speed, dependent on the engine speed to some extentC
keeps constant at all engine speed, independent of the engine speedD
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单选题The high pressure in fuel injection system of the diesel engine is produced by the （）.A
injector pumpB
fuel injectorC
governorD
turbocharger
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单选题If a diesel engine turned over at normal cranking speed but failed to start, the cause could be late fuel injection or （）A
excessive fuel pressureB
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excessive starting air pressure
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supply pressure to the pumpD
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单选题Which of the listed set of conditions indicates early fuel injection timing?（）A
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cylinder compression temperature may be too highC
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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
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early injection timingB
worn orifices in the injection nozzlesC
worn or scored cylinder linersD
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考题
单选题A fuel injection valve opening at pressure lower than normal will result in（）.A
late fuel injectionB
early fuel injectionC
high exhaust temperature from that cylinderD
decreased effective stroke from that injector
考题
单选题Early fuel injection timing is indicated by the cylinder pressure being（）A
above normal with a below normal exhaust temperatureB
above normal with a normal exhaust temperatureC
below normal with a normal exhaust temperatureD
below normal with an above normal exhaust temperature
考题
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low exhaust temperatureB
low exhaust pressureC
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low firing pressure and normal exhaust temperaturesC
high firing pressure and low exhaust temperaturesD
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can’t be controlled very preciselyB
can’t be controlled as flexibly as the separate pump systemC
can be controlled as flexibly as the separate pump systemD
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increase the starting air pressureB
use a higher than normal cranking speedC
increase the fuel injection pressureD
use a fuel having a lower ignition temperature
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单选题The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）A
degree of cylinder air turbulenceB
firing pressure in the engineC
quality of fuel to be injectedD
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high lube oil temperatureB
low lube oil temperatureC
excessive cylinder coolingD
high air injection pressure
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