Theory of Machine
In involute gears, the pressure angle is

Always variable
Dependent on the size of gears
Dependent on the size of teeth
Always constant

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Theory of Machine
Cam angle is defined as the angle

Of rotation of the cam for a definite displacement of the follower
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
During which the follower returns to its initial position
Through which, the cam rotates during the period in which the follower remains in the highest position

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