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

Torsional vibration
Transverse vibration
Longitudinal vibration
None of these

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Open belt drive is recommended
Both open belt drive and crossed belt drive is recommended
Crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted

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