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What is the frequency of the generated EMF in a six-pole alternator running at 1200 rpm?
1. 60 Hz
2. 50 Hz
3. 40 Hz
4. 30 Hz

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Correct Answer - Option 1 : 60 Hz

Concept:

An alternator rotates with synchronous speed. The synchronous speed is given by

\({N_s} = \frac{{120f}}{P}\)

where f is the supply frequency

P is the number of poles

The frequency of induced emf in an alternator is the same as the supply frequency.

So, the frequency of induced emf is

\(f = \frac{{PN}}{{120}}\)

Calculation:

Given that, number of poles (P) = 6

Synchronous speed (Ns) = 1200 rpm

Frequency \(f = \frac{{6 \times 1200}}{{120}} = 60\;Hz\)

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