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

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• Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.

  A . compression B . maximum C . rated D . oil

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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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• The burning of fuel oil in a diesel engine having a high sodium content, will cause （）

  A . corrosion and grooving of exhaust valves B . corrosion and gumming of the fuel injection pump C . salt deposits in the exhaust manifold D . slag deposits in the fuel injection equipment

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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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• What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）

  A . White B . Black C . Blue D . Clear

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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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• A distorted spray pattern from a fuel injector can cause a diesel engine to have （）

  A . higher firing pressure B . more power output C . lower fuel pressure D . less power output

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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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• After changing out the fuel filters the diesel engine fails to restart, the most probable cause for this condition is a/an（）.

  A . low compression B . air-bound fuel system C . improper spark D . change in viscosity

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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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• Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.

  A . excessive fuel nozzle holder cooling B . sediment in the fuel supply C . distortion of the fuel spray pattern D . improper atomization of the fuel

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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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• Diesel fuel is relatively safe to handle due to its low volatility, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the （）.

  A . flash point B . auto-ignition point C . volatility point D . upper explosive limit

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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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• 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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• Clogged diesel engine fuel oil filters can cause（）

  A . loss of power B . misfiring C . low fuel oil pressure D . All of the above

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• Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）

  A . Leaking fuel injectors B . Lower than normal compression C . Delayed fuel injection D . All of the above are correct

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• There is a growing realization that the only effective way to achieve further reductions in vehicle（）is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.

  A . permission B . emission C . omission D . Missio

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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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• What is LEAST likely to cause ignition of fuel vapors ________．

  A.Static electricity B.An open running electric motor C.Loose wiring D.Explosion proof lights

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