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
For dynamic balancing of a shaft

Both (A) and (B)
The net dynamic force acting on the shaft is equal to zero
The net couple due to the dynamic forces acting on the shaft is equal to zero
None of these

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

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
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

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