In ________________ method of staging three phase induction motors the starting voltage is not reduced?
Correct answer: C. slip ring
- A. auto-transformer
- B. star-delta
- C. slip ring
- D. any of the above
Explanation
Star-delta and autotransformer starting reduce the voltage applied to the stator, whereas a slip-ring motor normally receives full stator voltage and limits starting current through rotor resistance. Thus the slip-ring method does not reduce the starting voltage.
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