Theory of Machine
The gear train usually employed in clocks is a

Differential gear
Sun and planet gear
Simple gear train
Reverted gear train

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

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
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
Of rotation of the cam for a definite displacement of the follower

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