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

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

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant couple is equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force is equal to zero
Resultant force and resultant couple are both equal to zero

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