Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Slider is a fixed link
Longest link is a fixed link
Coupler link is fixed
Smallest link is a fixed link

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Both (A) and (B)
The Ackerman steering gear is most economical
The Ackerman steering gear consists of turning pairs
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

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