Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

  PN / 2 Hz.
 120N / P Hz.
 120P / N Hz.
 120 / PN Hz.

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Electrical Machines
No load primary current in a transformer

 lags behind applied voltage by exactly 90Â&am
 lags behind applied voltage somewhat less than 90Ã
 leads the applied voltage by exactly 90Â&
 leads the applied voltage somewhat less than 90Ã&

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