5. The fast fatigable motor units are used predominantly for which of the following activities? A. Standing. B. Walking. C. Sleeping. D. Sitting. E. Jumping.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.