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

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

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Theory of Machine
Kinematic pairs are those which have

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

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