Discussion
The speed at which the field of a three-phase machine revolves depends on
Answer: C
Correct answer: the supply frequency and the number of poles
\[ N_s = \frac{120f}{P}. \] The revolving field is produced by three windings displaced in space and fed by currents displaced in time, and how fast the resultant travels round the bore depends only on how fast the currents alternate and how many pole pairs the winding is arranged into. Neither the load nor the applied voltage enters into it.
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