The frequency of a 12-pole alternator running at a speed of 500 rpm is:

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MPPKVVCL Indore JE Electrical 21 August 2018 Official Paper
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  1. 60 Hz
  2. 40 Hz
  3. 50 Hz
  4. 30 Hz

Answer (Detailed Solution Below)

Option 3 : 50 Hz
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Detailed Solution

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Concept

The synchronous speed of an alternator is given by:

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

where, Ns = Synchronous speed

f = Frequency

P = No. of poles

Calculation

Given, Ns = 500 rpm

P = 12

\(500={120\times f \over 12}\)

f = 50 Hz

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