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

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

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will stop.
 The motor will run in reverse direction.
 The motor will run much faster in the same direction.
 The motor will run at its normal speed in the same direction as before.

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