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單項選擇題

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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單項選擇題

Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?（）

A.Decreasing scavenge air pressure
B.Increasing exhaust temperatures before the turbine
C.Reduction in engine speed
D.All of the above

單項選擇題

The rate of wear on a cylinder liner depends on the （）

A.quality of air filtration
B.effectiveness of lubrication
C.type of fuel used
D.all of the above