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


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1.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

2.單項選擇題In diesel engineering practice, the term used to express the ignition quality of a particular fuel is（）

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

3.單項選擇題The cetane number rates fuels for diesel engines according to its （）

A.antiknock characteristics
B.ignition qualities
C.rates of vaporization
D.viscosity

4.單項選擇題Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）

A.increase in starting air pressure
B.increase in lube oil viscosity
C.compression expansion device
D.jacket water heater

5.單項選擇題The burning of fuel oil in a diesel engine having a high sodium content, will cause （）

A.corrosion and grooving of exhaust valves
B.corrosion and gumming of the fuel injection pump
C.salt deposits in the exhaust manifold
D.slag deposits in the fuel injection equipment