單項(xiàng)選擇題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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1.單項(xiàng)選擇題Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?（）

A.Exhaust energy would draw excess air
B.The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increase
C.Exhaust gas pumping losses are increased due to turbine windage
D.Exhaust gas back pressure falls slightly due to increased nozzle action

2.單項(xiàng)選擇題Cold weather starting of a diesel engine is more difficult than warm weather starting due to（）

A.use of low viscosity oil in cold weather
B.increased moisture content of inlet air in cold weather
C.increased drag of pistons and bearings due to increased oil viscosity
D.higher compression pressures reached due to smaller clearances existing in the engine during cold weather

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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