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A 6-pole, 50 Hz wound rotor induction motor when supplied at the rated voltage and frequency with slip-ring open-circuited, developed a voltage of 100 V between any two rings. If the rotor is driven by an external means at 1000 rpm opposite to the direction of stator field, the frequency of voltage across slip-rings will be _______ Hz .
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- 50 Hz
- 100 Hz
- 300 Hz
- None of the above
Correct Option: B
| ns = | = 1000 rpm. | |
| 6 |
Rotor is driven in opposite direction, hence slip
| = | = 2 | |
| 1000 |
∴ Frequency of voltage across the slip ring = s.ns = 2 × 50 = 100 Hz
