Automobile Engineering in ME
The basic purpose of providing caster angle on wheels is to

Maintain directional control
Compensate for wear in the steering linkage
Bring the road contact of the tyre under the point of load
Prevent uneven tyre wear

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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 makes petrol engines lighter
Less compression ratio gives better performance
It is just customary to have less compression ratio in petrol engines

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