Theory of Machine
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

None of the listed here
At 45° to PO
Perpendicular to PO
Along PO

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

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
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

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