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
相似题目
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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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The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.
A . chemical ignition
B . spontaneous combustion
C . chemical combustion
D . radiation ignitio
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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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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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Which of the following conditions must exist for heat to flow from one object to another?（）
A . The two objects must be in physical contact
B . The two objects must be the same size
C . There must be an existing temperature differential
D . There must be an existing weight differential
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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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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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Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）
A . Chain reaction
B . Thermal action
C . Chemical occlusion
D . Pyrotechnical reactio
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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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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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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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Why did the man wait in the heat for two hours?
A . The coach had to be replaced．
B . The coach driver felt sick．
C . The hotel rooms were full．
D . The hotel had to be cleaned．
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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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What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）
A . Electricity
B . Chain reaction
C . Pressure
D . Smoke
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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 burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）
A . the burning
B . the fuel
C . the air charge
D . the engine pisto
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Of all the extingushing agents listed below, which one has the greatest capacity for heat absorption？______.
A.Water fog
B.Carbon dioxide
C.Dry chemical
D.Solid stream of water
