Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Clearance circle
Addendum circle
Pitch circle
Dedendum circle

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

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

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