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

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
Reduces the amount of kickback for large steering angles

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Creates swirl
Increases the combustion temperature
Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

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