Automobile Engineering in ME
In a four speed four stroke Diesel engine, the intake valve

opens at 20° before T.D.C. and closes at 35° after B.D.C.
opens at 10° after T.D.C. and closes at 20° before B.D.C.
opens at T.D.C. and closes at B.D.C.
not listed here

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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
All plies run parallel to one another and vertical to tyre bead
Inner tubes are always used
None of these

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