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

Free vibration
Under damped vibration
Damped vibration
Forced 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.
A convex flank is always in contact with concave flank.
The variation in centre distance of shafts increases radial force.
The interference is inherently absent.

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