Automobile Engineering in ME
In order to implement gear changes in the gear unit of an automatic transmission, a ___________ is used.

Synchronizer
Magnetic clutch
Hydraulic multi plate clutch
Planetary gear

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

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
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

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