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
Reduces the amount of kickback for large steering angles
Makes the steering more responsive

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Automobile Engineering in ME
The advantage of having a tandem master cylinder arrangement in automobiles is that it

Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
Enhances safety by serving two independent lines in a divided line brake circuit
Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side

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