Automobile Engineering in ME
In radial tyres

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
None of these

ANSWER DOWNLOAD EXAMIANS APP

Automobile Engineering in ME
The function of a second ring is that it is a

Back up compression ring which will work in place of the top ring when it is broken
Compression ring and aids the top ring in sealing and cooling
Cushion ring which prevents piston slap and knock
Back up oil control ring which will work in place of the bottom ring when it is broken

ANSWER DOWNLOAD EXAMIANS APP