Theory of Machine
In involute gears, the pressure angle is

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

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

During which the follower returns to its initial position
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
Through which the cam rotates during the period in which the follower remains in highest position

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