Internal Combustion Engines
Stoichiometric ratio is

Actual air-fuel ratio for maximum efficiency
Chemically correct air-fuel ratio by weight
None of these
Chemically correct air-fuel ratio by volume

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

May open and close anywhere
Opens at bottom dead centre and closes at top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at 30° before bottom dead centre and closes at 10° after top dead centre

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