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

None of these
Surface contact
Body contact
Line or point contact

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Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
Which of the following property of the instantaneous center is correct?

A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.
The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
All of these
The two rigid links have no linear velocity relative to each other at the instantaneous centre.

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