Internal Combustion Engines
In a four stroke cycle petrol engine, the compression

May start and end anywhere
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
Starts at bottom dead centre and ends at top dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre

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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
Pick up the wrong statement about supercharging

Supercharging at high altitudes is essential
There can be limited supercharging in petrol engines because of detonation
Supercharging reduces knocking in diesel engines
Supercharging results in fuel economy

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