Theory of Machine
When a slider moves on a fixed link having curved surface, their instantaneous centre lies

At the centre of curvature
At the pin joint
On their point of contact
At the centre of circle

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

Through which the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for a definite displacement of the follower
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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