Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Pitch circle
Dedendum circle
Clearance circle
Addendum circle

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

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