Clogged diesel engine fuel oil filters can cause（）

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• A leaking diesel engine fuel injector will cause（）

  A . prolonged maintenance intervals B . improved atomization C . greater fuel economy D . incomplete combustio

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• An indication of a diesel engine air intake being partially clogged, is （）.

  A . low firing pressure and low exhaust temperatures B . low firing pressure and normal exhaust temperatures C . high firing pressure and low exhaust temperatures D . high firing pressure and high exhaust temperature

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• Diesel engine fuel oil contamination often results in （）

  A . governor malfunctions B . fuel injection system malfunctions C . high cylinder lube oil temperatures D . low intake temperature

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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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• 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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• Proper atomization of fuel in diesel engine combustion chambers will （）.

  A . affect the injection pressure B . improve combustion C . reduce compression pressure D . decrease power output

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• Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

  A . an increased flash point B . higher lube oil pressures C . an increased viscosity D . lower lube oil pressure

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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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• 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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• 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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• Burning fuel with a high sulfur content in a diesel engine will （）

  A . increase thermal efficiency B . cause clogging of the fuel system C . increase the ability of the engine to start in cold weather D . produce corrosion in the cylinder and exhaust system at low load

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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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• 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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• Fuel is ignited in a diesel engine cylinder by （）

  A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

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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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• Clogged or partially obstructed exhaust ports on a diesel engine can cause（）

  A . over-speeding of the engine B . failure of the engine to shut down C . no effect of engine mounting bolts D . high exhaust temperature

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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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• 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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• Burning fuel with a high sulfur content in a diesel engine will ＿.

  A.increase thermal efficiency B.cause clogging of the fuel system C.increase the ability of the engine to start in cold weather D.produce corrosion in the cylinder and exhaust system at low loads

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