Engine_2014 : Electricity - 844/2299
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| How is the speed of a multi-speed squirrel-cage induction motor operating at a constant frequency usually changed? |
| A) varying the frequency to the machine |
| B) adding resistance in series with the stator windings |
| C) adding resistance in parallel with the stator windings |
| D) changing the number of connected poles in the stator |
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