Toothed gearing

Belt and rope drive

Ball and roller bearing

all of these

A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.

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 the above

Correct

Incorrect

Correct

Incorrect

reduce vibration

reduce slip

ensure uniform loading

ensure proper alignment