Internal Combustion Engines
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be

None of the listed here
Lower
Higher
Remain unaffected

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

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