SSE JE Electrical Engineering 10 Dec 2020 Papers

Question : 175 of 200

Marks: +1, -0

A motor generator set used for providing variable frequency AC supply consist of a three-phase, 10-pole synchronous motor and a 24-pole, three-phase synchronous generator. The motor-generator set is fed from a 25 Hz, three-phase AC supply. Determine the frequency of the generated voltage of the synchronous generator.

40 Hz
50 Hz
25 Hz
60 Hz

Validate

Solution:

\f_\m = 25 \Hz

\P_\m = 10

\P_\g = 24

We know that,

\f_\g \P_\m = \f_\m\P_\g

10 \f_\g= 25 × 24

∴ \f_\g= 60 \Hz

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