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The frequency of voltage generated in an alternator depends on

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The frequency of voltage generated in an alternator depends on
1. number of poles
2. rotative speed
3. number of poles and rotative speed
4. number of poles, rotative speed and type of winding
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Correct Answer - Option 3 : number of poles and rotative speed

The output frequency of an alternator is decided by two factors, rotor speed and number of poles.

N = 120f/P

Where,

N = Speed of rotor in rpm

f = Frequency of generated emf

P = Number of Poles
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