The (auto)ignition temperature is that temperature atwhich（）.

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• The lowest temperature at which fuel combustion becomes self-sustaining in the presence of a source of ignition, is defined as the （）

  A . auto-ignition point B . flash point C . burning temperature D . fire point

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• A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）

  A . low lube oil temperature B . low starting air temperature C . air bubbles in the fuel oil system D . water in the starting air system

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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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• 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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• The longer the ignition delay period resulting from improper use of low cetane fuel, the （）

  A . less fuel will enter the cylinder B . higher the cylinder combustion temperature C . more complete the fuel combustion D . more rapid the rise in combustion pressure

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

  A . cetane number B . volatility point C . viscosity index D . octane number

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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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• What is it called when it is possible to ignite the vapour above the oil?（）

  A . Flash point B . Boiling point C . Ignition point D . Pour point

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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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• The higher the cetane number, （） the ignition quality of the fuel.

  A . the worse B . the better C . the smaller D . the greater

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• Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?（）

  A . Viscosity B . Sulfur content C . Pour point D . Cetane number

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• When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）

  A . the amount of lube oil additives increase B . piston speeds increase C . injection pressure decrease D . engine speeds decrease

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• The minimum speed an engine must attain before ignition can occur depends upon （）.

  A . the type and size of the engine B . the condition of the engine C . ambient temperature D . all of the above

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• The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.

  A . boiling point B . flash point C . viscosity point D . toxic point

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• According to the Chemical Data Guide，what does ethyl chloride produce when ignited?（）

  A . Toxic fumes of oxides of nitrogen B . Toxic fumes of lead C . Poisonous phosgene gas D . Poisonous chlorine ga

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• The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the（）.

  A . flash point B . fire point C . upper explosive limit D . lower explosive limit

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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 ignited, which of the listed materials would be a class "B" fire?（）

  A . Magnesium B . Paper C . Wood D . Diesel Oil

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• In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.

  A . cooling water B . vapor from the boiler C . starting air D . hot gase

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• During working, when the piston is near the （）, the air ignites the fine spray of fuel.

  A . TDC B . DTC C . BDC D . BCD

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• The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

  A . air bottle B . air compressor C . crank case D . combustion chamber

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• The text tells us that the reason inhibited temperaments cannot be so easily connected to social phobia is______.

  A．there is weak evidence linking the two B．there are many uninhibited temperaments that do not develop social phobia C．the reactions in the brain are substantially different D．temperaments are part of human diversity, not abnormalities

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• The Protestant Reformation was not ignited by the__（）

  A．the problematic survival of Christianity B．the corruption in the Roman Catholic Church C．the influence from politics D．the disagreement on leadership 此题为多项选择题。

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