WBCHSE HS Vocational Power Practice Questions - West Bengal HS Vocational Examination - Power Trade Exam

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What is the formula for the synchronous speed (Ns) of a 3-phase alternator in terms of supply frequency (f) and number of poles (P)?

Ns = 120 * f / P Ns = 60 * f / P Ns = 120 * P / f Ns = P * f / 120

Correct Answer:

Ns = 120 * f / P

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