Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）

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• Failure of fuel injection is usually due to trouble in the （）.

  A . exhaust valves B . mechanical lubricators C . cooling water pumps D . fuel injection pum

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• Fuel injection valves should be taken out, cleaned, and lifting checked every （）.

  A . two to four months B . four to six months C . six to eight month

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• 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 vibratio

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• Heat damage to fuel injection nozzles can be prevented by avoiding （）

  A . excessive fuel oil temperature B . long periods of engine overload C . metallic contact between nozzles and cylinder heads D . hard carbon deposit and varnish on the nozzle

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• During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.

  A . ensure penetration and distribution of the fuel in the combustion chamber B . ensure the needle valve is flushed clean during each injection C . prevent combustion gas blowback into the open needle valve D . prevent reflected pressure waves when the needle valve close

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• A diesel engine will lose power if fuel injection occurs too early because the （）

  A . fuel will not be properly atomized in the cylinder B . ignition will be delayed due to low ignition temperature C . maximum fuel expansion will occur on the compression stroke D . fuel will ignite before top dead center

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• When fuel is injected late into a diesel engine cylinder,（）.

  A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

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• Significant retardation of a diesel engine fuel injection timing will result in （）

  A . smoother engine operation B . advanced fuel ignition C . increased fuel economy D . reduced engine power

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• In a diesel engine, when the fuel is injected into the cylinder,（）

  A . the piston is just coming upward from the bottom dead center B . the piston has moved about one-fifth of the way up C . the piston has moved most of the way up and almost reached the TDC D . the piston has just past the TDC

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• The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as （）.

  A . injection B . penetration C . atomization D . compressio

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• In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.

  A . increase its quality B . obtain complete burning C . reduce its weight D . all of the above

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• If the needle valve in a fuel injection nozzle sticks open （）.

  A . no fuel will be delivered through the nozzle B . the nozzle will overheat and crack C . time of injection will change D . fuel will leak into the drain line

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• Late fuel injection timing is indicated by （）

  A . lower than normal cylinder pressure and low exhaust temperature B . lower than normal cylinder pressure and high exhaust temperature C . higher than normal cylinder pressure and low exhaust temperature D . higher than normal cylinder pressure and high exhaust temperature

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• Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.

  A . water in the fuel oil supply B . excessive fuel nozzle holder cooling C . a distorted fuel spray pattern D . leakage past the plunger into the oil drai

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• In a common rail engine, the fuel is injected into cylinders（）

  A . by injection pumps B . at a time decided by the injection pump timing C . by a signal opening the magnetic valves D . at a time decided by the cam directly

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• The sequence of fuel injection into cylinders is determined by （）.

  A . the steering B . the driven gear C . the turning gear D . the timing gear

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• Fuel injection systems meter fuel, atomize fuel, and （）.

  A . create turbulence in the combustion chamber B . aid in completing cylinder scavenging C . inject fuel at the proper time D . minimize fuel penetration into the cylinder

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• Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.

  A . lower compression pressures B . overheating without smoking C . failure to start D . a run away without load

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• The major cause of fuel pump and injection system problems is （）

  A . improper adjustments B . contaminated fuel C . kinked fuel lines D . excessive engine vibratio

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• The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

  A . has begun B . takes place C . occurs D . happe

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• Most fuel injection nozzles are opened by （）.

  A . fuel oil pressure B . a cam operated follower C . a spring-loaded pressure plate D . timing gears keyed to the crankshaft

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• If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）

  A . only the replacement of the entire pump would be acceptable B . the injection pump and injection nozzle must be replaced C . either the barrel or plunger must be replaced D . the barrel and plunger must be replaced as a unit

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• Early fuel injection timing is indicated by the cylinder pressure being（）

  A . above normal with a below normal exhaust temperature B . above normal with a normal exhaust temperature C . below normal with a normal exhaust temperature D . below normal with an above normal exhaust temperature

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• To minimize the formation of carbon deposits on fuel injection nozzles, you should （）

  A . avoid using liquid-cooled nozzles whenever possible B . avoid low cooling water temperatures C . avoid prolonged overloading of the engine D . make certain the gasket seal between the nozzle and cylinder head is tight

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