Internal Combustion Engines
Which of the following statement is correct regarding petrol engines?

A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
All of these
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug

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

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