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

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

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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 the gear shaft lever
Eliminates gear clutches
Reduces the number of automatic transmission components

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

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