Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Body contact
Line or point contact
Surface contact
None of these

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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
In elliptical trammels

Two pairs turning and two pairs sliding
All four pairs are turning
One pair turning and three pairs sliding
Three pairs turning and one pair sliding

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