Automobile Engineering in ME
The basic purpose of providing caster angle on wheels is to

Compensate for wear in the steering linkage
Maintain directional control
Prevent uneven tyre wear
Bring the road contact of the tyre under the point of load

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Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design
The unsprung mass in lighter
The vertical size of the suspension can be made more compact
Non vertical external forces are supported by the suspension arms

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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
Makes the steering more responsive
Allows the steering wheel to be turned by a greater amount when steering
Reduces the amount of kickback for large steering angles

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