Theory of Machine
Creep in belt drive is due to

Uneven extensions and contractions due to varying tension
Material of the pulley
Larger size of the driver pulley
Material of the belt

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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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