单项选择题

Which of the following statements is true concerning the cetane number rating of diesel fuel? （）

A.The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbon
B.The higher the cetane number, the shorter the ignition lag
C.The highest cetane number of fuel is 100
D.All of the above

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单项选择题

Which of the following statements is true concerning the cetane number of diesel fuel?（）

A.The cetane number affects the amount of injection lag
B.The cetane number is an indication of the fuels viscosity
C.Ignition lag is reduced with fuels having a high cetane number
D.The cetane number is of little significance in the combustion process

单项选择题

Fuel oil having a low cetane rating could result in（）

A.improved cold weather starting
B.excessive fuel oil consumption
C.reduced ignition lag
D.smoother engine operation

单项选择题

The ignition quality of a fuel oil is an important operational consideration because it（）

A.indicates the amount of abrasive material in the fuel
B.affects the starting ability of a cold engine
C.determines the amount of fuel penetration engine
D.affects the compression ratio of an operating engine