A 200/100 V, 50 Hz transformer is to be excited at 40 Hz

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A 200/100 V, 50 Hz transformer is to be excited at 40 Hz from the 100 V side. For the exciting current to remain the same, the applied voltage should be _______ V.

1. 10 V
2. 30 V
3. 40 V
4. 80 V

Correct Option: D

NA