Automobile Engineering in ME
In radial tyres

None of these
One ply layer runs diagonally one way and another layer runs diagonally the other way
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 compression ratio in petrol engine is kept less than in Diesel engine because

Less compression ratio gives better performance
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

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Delivers improved cornering on dry road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces

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