Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Transverse vibrations
Longitudinal vibrations
All of these
Torsional vibrations

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

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

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