Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Reduces the amount of kickback for large steering angles
Allows the steering wheel to be turned by a greater amount when steering
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Makes the steering more responsive

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Automobile Engineering in ME
The major purpose of an electronically controlled automatic transmission is that this type of transmission

Reduces shift shock and achieves more efficient transmission of engine torque
Eliminates gear clutches
Reduces the number of automatic transmission components
Eliminates the gear shaft lever

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

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