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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 intakes
B
develop less power under load
C
have high firing pressures
D
lift its cylinder relief valves
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更多 “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” 相关考题
考题
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
考题
_______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.A.Excessive fuel nozzle holder coolingB.Sediment in the fuel supplyC.Distortion of the fuel spray patternD.Improper atomization of the fuel
考题
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
考题
单选题Load control on a diesel engine is accomplished by （）.A
regulating the speed of the turbochargerB
rotating the fuel injector pump plungerC
regulating the speed of the fuel oil transfer pumpD
changing engine timing
考题
单选题With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the （）.A
ship draftB
pitchC
engine loadD
oil viscosity
考题
单选题The burning of fuel oil in a diesel engine having a high sodium content, will cause （）A
corrosion and grooving of exhaust valvesB
corrosion and gumming of the fuel injection pumpC
salt deposits in the exhaust manifoldD
slag deposits in the fuel injection equipment
考题
单选题Problems with the diesel engine fuel injection pump are usually caused by（）A
improper adjustmentB
contaminated fuelC
kinked fuel linesD
excessive engine vibration
考题
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
IHPD
MEP
考题
单选题If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?（）A
Increase the cooling water flow to the engineB
Secure or reduce fuel to that cylinderC
Screw down on the pressure adjusting spring to decrease to decrease popping pressureD
Readjust the injection timing
考题
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
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
考题
单选题Turbulence is created in the cylinders of a diesel engine to （）A
obtain injection lagB
help mix fuel and airC
increase combustion pressureD
utilize higher injection pressures
考题
单选题To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.A
reduce the engine driven fuel pump outlet pressureB
retard the fuel injector timing to reduce powerC
increase the fuel rack settingD
reduce the load on the engine
考题
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
考题
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
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
考题
单选题Which of the following is true about the fuel injection with an ordinary diesel engine?（）A
The process begins after TDCB
The process ends before TDCC
When the piston is near to the TDC the fuel injection endsD
None of the above is true
考题
单选题Injection lag in a diesel engine may be caused by（）A
a higher cetane number of fuel oilB
the diesel fuel used having a high viscosityC
mechanical rigidity in the lube pump mechanismD
a decrease rigidity in the fuel pump delivery pressure
考题
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Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
improper atomization of the fuel
考题
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）A
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
考题
单选题With （） unit the timing of fuel injection of an engine can be regulated automatically.A
MBTB
MEGC
VSGD
VIT
考题
单选题When ship navigating in rough sea, the correct operation is （）A
navigating with a low diesel engine speedB
navigating with a stable diesel engine speedC
increasing the efficiency of propellerD
increasing fuel injection
考题
单选题Turbulence in a diesel engine cylinder is of major importance in providing （）.A
proper fuel meteringB
complete fuel/air mixingC
minimal fuel penetrationD
proper fuel timing
考题
单选题Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to （）A
burn excessive amounts of lube oilB
overheat without smokingC
operate with reduce power or stopD
run away without load
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