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

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
All of these
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

Opens at top dead center and closes at bottom dead center
Opens at 10° after top dead center and closes 20° before the bottom dead center
Opens at 20° before top dead center and closes at 35° after the bottom dead center
May open or close anywhere

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for combustion sent under pressure
Burnt air containing products of combustion
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Forced air for cooling cylinder

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