Rolling pair
Sliding pair
Turning pair
Spherical pair

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

The two rigid links have no linear velocity relative to each other at the instantaneous centre.
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
A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.

Minimum
Zero
Maximum
None of these

## Theory of Machine The pair is known as a higher pair, when the relative motion between the elements of a pair is

Rolling only
Sliding only
Turning only
Partly turning and partly sliding

## Theory of Machine In order to give a complete secondary balance of a multi-cylinder inline engine,

None of these
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
The algebraic sum of the secondary forces must be equal to zero
Both (A) and (B)