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单选题
The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.
A
because
B
though
C
since
D
until
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单选题Fuel injection equipment must be kept in good condition, timed correctly, and the （）in each cylinder must also be carefully balanced so that individual cylinders are not overloaded.A
MIPB
MCRC
MEPD
BHP
考题
单选题Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）A
changes the position of the fuel inlet portsB
changes the length of the pump strokeC
varies the quantity of fuel deliveredD
varies the compression of the delivery valve spring
考题
单选题With VIT the start of injection may be （） as the engine load is reduced within a certain range.A
advancedB
retardedC
relayedD
cut off
考题
单选题Failure of fuel injection is usually due to trouble in the （）.A
exhaust valvesB
mechanical lubricatorsC
cooling water pumpsD
fuel injection pumps
考题
单选题Excessive diesel engine back pressure may be an indication of （）A
carbon buildup in the exhaust manifoldB
overcooling of the exhaust manifoldC
eroded muffler baffle platesD
high injection pressure
考题
单选题A diesel engine will lose power if fuel injection occurs too early because the （）A
fuel will not be properly atomized in the cylinderB
ignition will be delayed due to low ignition temperatureC
maximum fuel expansion will occur on the compression strokeD
fuel will ignite before top dead center
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permanentC
occasionalD
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考题
单选题Air chambers are usually fitted to reciprocating pumps in order to （）.A
increase discharge pressureB
increase suction vacuumC
develop pulsation flowD
keep a steady rate of flow
考题
单选题In the common rail system, excessive pressure in the header may be caused by （）A
improper adjustment of the bypass valveB
a dribble in the fuel injection nozzleC
insufficient leak-off through injection nozzle packingD
a malfunctioning injection nozzle
考题
单选题In order to ensure perfect atomization, the fuel oil （） before injection.A
has to be cooledB
has heatedC
has preheatedD
has to be preheated
考题
单选题With Variable Injection Timing the start of injection may be （）as the engine load is reduced.A
advancedB
retardedC
kept constantD
none of the above
考题
单选题The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）A
camshaftB
crankshaftC
governorD
flywheel
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单选题If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.A
cylinder compression pressure may not be high enoughB
cylinder compression temperature may be too highC
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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
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考题
单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）A
early injection timingB
worn orifices in the injection nozzlesC
worn or scored cylinder linersD
using a fuel with too low of a cetane number
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