Theory of Machine
Creep in belt drive is due to

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

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

None of the listed here
Moves as the mechanism moves, but joints are of permanent nature
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism

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