Theory of Machine
The example of successfully constrained motion is a

Motion of the shaft between a footstep bearing
Piston reciprocating inside an engine cylinder
Motion of an I.C. engine valve
All of these

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

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

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