Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Fixed instantaneous centers
Neither fixed nor permanent instantaneous centers
Permanent instantaneous centers
None of these

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Theory of Machine
The maximum fluctuation of speed is the

Variations of speed above and below the mean resisting torque line
Difference of the maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Sum of maximum and minimum speeds

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