Automobile Engineering in ME
Two advantages of using helical gears rather than spur gears in a transmission system are

Noise level and strength
Strength and less end thrust
Strength and cost
Noise level and economy

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Automobile Engineering in ME
In radial tyres

Inner tubes are always used
None of these
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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