Theory of Machine
In a gear having involute teeth, the normal to the involute is a tangent to the

Addendum circle
Pitch circle
Dedendum circle
Base circle

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Theory of Machine
A body is said to be under forced vibrations, when

No external force acts on a body, after giving it an initial displacement
A body vibrates under the influence of external force
None of these
There is a reduction in amplitude after every cycle of vibration

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