Theory of Machine
A foot step bearing and rotor of a vertical turbine form examples of

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

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

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
Both (A) and (B)
The Ackerman steering gear is most economical

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Theory of Machine
In a four bar chain or quadric cycle chain

One is a turning pair and three are sliding pairs
Each of the four pairs is a turning pair
Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs

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