Theory of Machine
When the particles of a body moves perpendicular to its axis, then the body is said to have

Torsional vibration
Longitudinal vibration
Transverse vibration
None of these

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

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

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