Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

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

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

All of these
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
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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