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

Dedendum circle
Clearance circle
Pitch circle
Addendum circle

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Theory of Machine
The direction of Coriolis component of acceleration is the direction

Along the centripetal acceleration
Along tangential acceleration
Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
Along perpendicular to angular velocity

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