Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

Best quality fuel is used
It is properly designed
Flywheel size is proper
Cannot work as it is impossible

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Internal Combustion Engines
Pick up the wrong statement about supercharging

There can be limited supercharging in petrol engines because of detonation
Supercharging results in fuel economy
Supercharging reduces knocking in diesel engines
Supercharging at high altitudes is essential

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Internal Combustion Engines
In a four stroke cycle diesel engine, the inlet valve

Opens at 20° after top dead center and closes at 20° before bottom dead center
May open and close anywhere
Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at top dead center and closes at bottom dead center

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Exhaust valve closing after top dead center
Inlet valve closing before bottom dead center
Inlet valve opening before top dead center
Inlet valve closing after bottom dead center

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