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单选题
Problems with the diesel engine fuel injection pump are usually caused by()
A
improper adjustment
B
contaminated fuel
C
kinked fuel lines
D
excessive engine vibration
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If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at theA.fuel line connections to the cylinder injection valvesB.gasket surfaces of the fuel oil filtersC.discharge fittings of the fuel injector pumpsD.suction side of the fuel oil transfer pump
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Which of the following problems is the main source of fuel pump and injection system malfunctions?A.Improper lubricationB.Air in the fuel systemC.Coated fuel linesD.Excessive vibration
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The major cause of fuel pump and injection system problems is _____.A.improper adjustmentsB.contaminated fuelC.kinked fuel linesD.excessive engine vibration
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_______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
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One cause of diesel engine surging can be a result of ______.A.injection pump plungers stuck or wornB.low compressionC.solenoid stuck openD.fuel tank too full
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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
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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
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单选题Which of the following problems is the main source of fuel pump and injection system malfunctions?()A
Improper lubricationB
Air in the fuel systemC
Coated fuel linesD
Excessive vibration
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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
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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
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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
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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
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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
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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The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to ().A
assist in a quick cutoff of fuel injectionB
allow oil backflow from the injector to the helixC
reduce fuel oil pressure between injection strokesD
meter the quantity of fuel delivered
考题
单选题The major cause of fuel pump and injection system problems is ()A
improper adjustmentsB
contaminated fuelC
kinked fuel linesD
excessive engine vibration
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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
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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
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单选题Fuel injection uses the jet pump system and a Woodward type hydraulic () is used to control engine speed.A
controllerB
governorC
instrumentD
apparatus
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单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?()A
The fuel metering will varyB
The fuel will explodeC
The cylinder head will crackD
The engine will stop
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单选题The major cause of problems occurring with fuel injection equipment is()A
incorrect replacement of barrels and plungers of jerk pumpsB
overheating of the nozzle orificesC
cracked pump housingsD
dirt in the fuel
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单选题The most common diesel engine fuel system problems are caused by ().A
incorrect adjustmentsB
dirty fuelC
broken fuel linesD
excessive vibration
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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
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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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