A single phase 440 V, 60 Hz induction motor is to be operated

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A single phase 440 V, 60 Hz induction motor is to be operated at 25 Hz. Voltage that should be applied to the machine if air gap flux density is to be maintained at its normal value, is _______ V

1. 13 V
2. 83 V
3. 113 V
4. 183 V

Correct Option: D

NA