Theory of Machine
Two systems shall be dynamically equivalent when

The mass of two are same
G. of two coincides
M.I. of two about an axis through e.g. is equal
All of these

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Theory of Machine
Angle of dwell of cam is defined as the angle

Of rotation of the cam for definite displacement of the follower
Through which the cam rotates during the period in which the follower remains in the highest position
During which the follower returns to its initial position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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Theory of Machine
In elliptical trammels

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

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