Automobile Engineering in ME
In radial tyres

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

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Act as a reservoir or stabilizer of electricity
Supply a large amount of power to turn the starter motor when the engine is being started
Supply electricity to the vehicle's electrical system at all times while the engine is running
Supply electricity to the alternator

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