Diesel fuel vapors （）.

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• Fueling activities（）waste liquids and vapor releases to air.

  A . commence B . generate C . give D . have

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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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• 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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• 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 vapors given off by heated fuel oil are flammable, explosive, and （）

  A . lighter than air B . heavier than air C . odorless D . nontoxic

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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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• The ignition quality of diesel fuel is indicated by its（）

  A . octane number B . cetane number C . viscosity in Saybolt seconds D . air fuel ratio

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• In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）

  A . injection lag B . ignition delay C . compression D . turbulence lag

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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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• Which of the following statements is least likely to cause the ignition of fuel vapors?（）

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

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• Which statement is TRUE concerning fuel vapors on a vessel（）.

  A . Fuel vapors gather in the lowest portions of the vessel B . Fuel vapors can only be ignited by an open flame C . Vent outlets should be located above the level of the carburetor air intake D . None of the above

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• The vapors given off by heated fuel oil are heavier than air and are（）.

  A . odorless B . explosive C . nontoxic D . visible

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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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• 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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• A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

  A . excessive cylinder lubrication B . a lugging engine C . a leaking cylinder liner D . overloading of one cylinder

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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 cetane number of a diesel fuel oil indicates its（）

  A . Viscosity B . acid content C . heating value D . ignition quality

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• Which may ignite fuel vapors?（）

  A . Static electricity B . An open and running motor C . Loose wiring D . All of the above

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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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• 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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• 原文:Gasoline is a fuel whose vapor is readily explosive..译文:汽油是一种燃料,其油气 。

  A、很容易蒸发 B、 很容易爆炸

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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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