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

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

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Automobile Engineering in ME
In radial tyres

None of these
Inner tubes are always used
All plies run parallel to one another and vertical to tyre bead
One ply layer runs diagonally one way and another layer runs diagonally the other way

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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Reduce the amount of sliding resistance
Reduce the amount of noise generated
Can deal with movement of the suspension both vertically and in other directions
Improve the force transmission speed

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