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

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

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Approaching the T.D.C position on its exhaust stroke
Approaching the T.D.C. position on its compression stroke
Exactly at the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke

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