Theory of Machine
Which of the following is an example of a higher pair?

Belt and rope drive
Toothed gearing
Ball and roller bearing
All of the listed here

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and one additional link
Any one of these
Two lower pairs and two additional links
One lower pair and two additional links

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