Automobile Engineering in ME
When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate

Mean effective pressure
Brake power
Compression ratio
Specific air consumption

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

Less compression ratio gives better performance
It makes petrol engines lighter
It is just customary to have less compression ratio in petrol engines
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

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