Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 equal to primary.
 greater than the primary.
 less than primary.

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Electrical Machines
Flashing the field of DC generator means

  neutralising residual magnetism.
  making the magnetic losses forces parallel.
 increasing flux density by adding extra turns of winding.
  creating residual magnetism by a DC source.

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