Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Completely constrained motion
Successfully constrained motion
Incompletely constrained motion
Partially constrained motion

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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)
The Ackerman steering gear is most economical
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

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