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The output frequency of an alternator depends on -


1. Type of winding
2. Number of poles and rotational speed
3. Number of poles only
4. Rotational speed only

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Correct Answer - Option 2 : Number of poles and rotational speed

The rotor speed of the alternator is given by

\(N = {{120f} \over P}\)       ........(1)

Where,

N = Speed of rotor in rpm

f = Frequency of generated emf

P = Number of Poles

From equation (1)

\(f = {{NP} \over 120}\)

\(f \propto {NP} \)

So the output frequency of an alternator depends on both the number of poles and rotational speed.

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