Theory of Machine
Creep in belt drive is due to

Material of the belt
Material of the pulley
Uneven extensions and contractions due to varying tension
Larger size of the driver pulley

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

Moved by the cam from beginning of ascent to the termination of descent
Through which the cam rotates during the period in which the follower remains in the highest 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 a definite displacement of the follower

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Theory of Machine
Pitch point on a cam is

The point on cam pitch curve having the maximum pressure angle
Any point on pitch circle
Any point on pitch curve
The point on cam pitch curve having the minimum pressure angle

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