单项选择题

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

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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
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单项选择题

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