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单选题
With Variable Injection Timing the start of injection may be （）as the engine load is reduced.
A
advanced
B
retarded
C
kept constant
D
none of the above
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ship draftB
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advancedB
retardedC
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单选题Early injection timing is indicated by （）.A
high exhaust temperature and low firing pressureB
high exhaust temperature and high firing pressureC
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单选题Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.A
BHPB
MCRC
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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
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carbon buildup in the exhaust manifoldB
overcooling of the exhaust manifoldC
eroded muffler baffle platesD
high injection pressure
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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 （）A
excessively late injection timing for each cylinderB
incorrectly adjusted intake valve timingC
incorrectly adjusted fuel injectorD
incorrectly adjusted intake valve clearance
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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
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单选题A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?A
turn engine with jacking gearB
drain filters and strainers and bleed off water at each injection pumpC
use ether to start the engine with blow-down valves openD
blow through the cylinders and fuel lines with a drying agent
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单选题The sequence of fuel injection into cylinders is determined by （）.A
the steeringB
the driven gearC
the turning gearD
the timing gear
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单选题A diesel engine could fail to start because of （）A
incorrect injection timingB
low exhaust back pressureC
floating exhaust valvesD
excessive cranking speed
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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（）A
backfire through the air intakesB
develop less power under loadC
have high firing pressuresD
lift its cylinder relief valves
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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
becauseB
thoughC
sinceD
until
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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
fuel oil injection pressure may not be high enoughD
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单选题An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）A
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retard as the load increaseC
remain unchanged regardlessD
always occur at top dead center
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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
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
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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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单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）A
cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
using a timing light
考题
单选题Significant retardation of a diesel engine fuel injection timing will result in （）A
smoother engine operationB
advanced fuel ignitionC
increased fuel economyD
reduced engine power
考题
单选题Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）A
Fuel injection timing will changeB
Nozzle operation will be unaffectedC
Fuel will leak into the drain lineD
Fuel will not be delivered
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
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单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）A
improper fuel rack positingB
lengthy exhaust valve durationC
extend operation at light loadD
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单选题With （） unit the timing of fuel injection of an engine can be regulated automatically.A
MBTB
MEGC
VSGD
VIT
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