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
Oldham's coupling is the

Third inversion of slider crank chain
Second inversion of double slider crank chain
Second inversion of single slider crank chain
Third inversion of double slider crank chain

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