Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 changes to 0.5 times the original value
 changes to three times the original value
 changes to 1.5 times the original value
 remain the same as the original

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Electrical Machines
The coil spam

 must be exactly equal to people pitch.
 none of above.
  may or may not be exactly equal to people pitch.
 can never be equal to pole pitch.

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