Calculate frequency of voltage across slip rings.

Q.  A 4 pole, 50 Hz, wound rotor inductor is supplied at rated voltage and frequency with slip ring open circuited. If the rotor is driven by an external means at 1500 rpm opposite to the direction of stator field, the frequency of voltage across slip rings will be
- Published on 23 Oct 15

a. 50 Hz
b. 80 Hz
c. 100 Hz
d. 0 Hz

ANSWER: 100 Hz

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