Late fuel injection timing is indicated by （）

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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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• 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 valve

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• The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.

  A . metering B . timing C . rate of injection D . rate of distributio

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

  A . prolong the ignition delay period B . ensure the beginning of fuel injection C . thoroughly utilize the air charge D . allow controlled fuel combustio

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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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• 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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• 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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• 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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• 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 . BHP B . MCR C . IHP D . MEP

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• With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the （）.

  A . ship draft B . pitch C . engine load D . oil viscosity

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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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• Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

  A . gears B . rams C . barrels D . cam

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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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• 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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• A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）

  A . fuel droplets will burn as they leave the fuel injector B . fuel will not be properly atomized in the cylinder C . maximum expansion of the burned fuel cannot take place in the cylinder D . compression pressure will be too low to cause fuel ignitio

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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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• Late fuel injection in a diesel engine is indicated by low firing pressure with（）

  A . high exhaust temperature B . low exhaust temperature C . fuel knock in each cylinder D . mechanical knock in each cylinder

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