Automobile Engineering in ME
The cam shaft in an engine is always mounted

Parallel to the crankshaft
Perpendicular to the crankshaft
None of these
Inclined to the crankshaft

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

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

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