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

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

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics
It is desired to have more flexibility in design
It is desired to reduce the unsprung mass
Large changes in load make it necessary to have a large suspension stroke

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