Internal Combustion Engines
For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

0.75069444444444
0.62569444444444
0.50069444444444
0.37569444444444

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

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