单项选择题

The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （）

A.increased compression ratio
B.decreased compression ratio
C.increased bearing clearance
D.decreased bearing clearance

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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

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