Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Under damped vibration
Forced vibration
Free vibration
Damped vibration

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Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
Lower pairs are those which have

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

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