Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Free vibration
Forced vibration
Under damped vibration
Damped vibration

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Theory of Machine
Which of the following statement is correct for involute gears?

The pressure angle is constant throughout the teeth engagement.
The variation in centre distance of shafts increases radial force.
A convex flank is always in contact with concave flank.
The interference is inherently absent.

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