Theory of Machine
The contact ratio is given by

(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of the arc of contact)/(Circular pitch)

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Theory of Machine
Which is the false statement about the properties of instantaneous center?

The two rigid links have no linear velocities relative to each other at the instantaneous center
At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
The double center can be denoted either by O2 or O12, but proper selection should be made

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Theory of Machine
In elliptical trammels

Two pairs turning and two pairs sliding
Three pairs turning and one pair sliding
All four pairs are turning
One pair turning and three pairs sliding

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