Theory of Machine
A kinematic chain is known as a mechanism when

Two of the links are fixed
None of the links is fixed
None of these
One of the links is fixed

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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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