Automobile Engineering in ME
For the same maximum pressure and temperature

Both Otto cycle and Diesel cycle are equally efficient
Otto cycle is more efficient than Diesel cycle
None of the listed here
Diesel cycle is more efficient than Otto cycle

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

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
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

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