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（）

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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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• Dirt in the fuel oil system of a diesel engine can cause （）.

  A . clogged filters B . poor combustion C . overloading of the diesel D . shock of fuel line

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• If the diesel fuel vapors present are within the flammable range （）.

  A . the vapor air mixture is too rich to burn B . an explosion may occur if a source of ignition is present C . the vapor air mixture is too lean to bum the upper explosive D . limit has been exceeded

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• The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）

  A . camshaft B . crankshaft C . governor D . flywheel

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• The most common diesel engine fuel system problems are caused by （）.

  A . incorrect adjustments B . dirty fuel C . broken fuel lines D . excessive vibratio

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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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• What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）

  A . Spark plug B . Heat of compression C . Carburetor D . Glow ping

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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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• When fuel enters the crankcase of a diesel engine, it （）

  A . dilutes the lube oil and reduces its viscosity B . forms sulfuric acid in the lube oil C . causes pitting and failure of the bearings D . causes sludge deposits on valve stem

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• Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）

  A . electronic ignition system B . compression of air by the piston C . friction in the fuel injector D . fuel oil bearing system

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• On a diesel engine, fuel is delivered into the combustion space by （）.

  A . a cooling system B . a lubrication oil system C . an electric system D . an injection system

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• Fuel is admitted to a diesel engine cylinder through the （）.

  A . intake valves B . carburetor C . exhaust ports D . injector nozzle

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• The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）

  A . governor flyweight action on a pilot valve which controls fuel injection B . governor flyweight motion acting on fuel controls through suitable linkage C . positioning a butterfly valve in the fuel delivery system positioning D . a servomotor piston attached to the fuel control

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• The heart of the diesel engine is the （） where the fuel is burnt and the power developed.

  A . crankcase B . cylinder C . scavenge box D . pisto

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• Fuel oil discharged to the diesel engine cylinder is atomized at the （）

  A . turbocharger B . injection nozzle tip C . carburetor D . fuel oil pum

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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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• If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）

  A . fuel line connections to cylinder injection valves B . gasket surfaces of the fuel oil filters C . discharge fitting of the fuel injector pumps D . suction side of the fuel oil tra

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• Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.

  A . spark plugs B . glow plugs C . heat of compression D . a magneto

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• If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）

  A . fuel pump should be removed and all connections blanked off B . cylinder oil feed rate should be increased slightly above that used at normal sea speed C . cylinder oil feed rate should be reduced D . cylinder oil feed rate should be increased to the maximum flow capable of the metering pum

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• The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by______.

  A.governor flyweight action on a pilot valve which controls fuel injection B.governor flyweight motion acting on fuel controls through suitable linkage C.positioning a butterfly valve in the fuel delivery system positioning D.a servomotor piston attached to the fuel controls

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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 vibration

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• The cetane number rates fuels for diesel engines according to its ＿.

  A.antiknock characteristics B.ignition qualities C.rates of vaporization D.viscosity

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• Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil？ .

  A.Water discharging from the water outlet of the lube oil purifier B.Fuel oil discharging from the water outlet of the lube oil purifier C.Lube oil discharging from the water outlet of the lube oil purifier D.A change in the lube oil viscosity

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