Internal Combustion Engines
The ratio of the indicated thermal efficiency to the air standard efficiency is known as

Volumetric efficiency
Overall efficiency
Mechanical efficiency
Relative efficiency

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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
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 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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