单项选择题

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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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

单项选择题

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

单项选择题

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