Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

In a circle about its axis
Perpendicular to its axis
Parallel to its axis
None of these

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Theory of Machine
Hammer blow

Varies inversely with the square of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed

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