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GATE Electrical 2017 Set 1 | Question: 8

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A $4$ pole induction machine is working as an induction generator. The generator supply frequency is $60$Hz. The rotor current frequency is $5$Hz. The mechanical speed of the rotor in $RPM$ is

  1. $1350$
  2. $1650$
  3. $1950$
  4. $2250$

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