Theory of Machine
The stress induced in a body will be shear stress, when it is subjected to

Longitudinal vibrations
Transverse vibrations
None of these
Torsional vibrations

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Theory of Machine
For dynamic balancing of a shaft

The net dynamic force acting on the shaft is equal to zero
The net couple due to the dynamic forces acting on the shaft is equal to zero
None of these
Both (A) and (B)

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Theory of Machine
Open pairs are those which have

Surface contact between the two elements when in motion
Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically

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