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
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
Less compression ratio gives better performance

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Automobile Engineering in ME
In radial tyres

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

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is pure sulphuric acid
The electrolyte is pure distilled water
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

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