Theory of Machine
The example of successfully constrained motion is a

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

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

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