Theory of Machine
The Ackermann steering mechanism is preferred to the Davis type in automobiles because

The former is having turning pair
The former is mathematically accurate
The former is most rigid
The former is most economical

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Theory of Machine
Higher pairs are those which have

Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion

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