Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Mechanical power.
 Can not be determined.
 Induced emf.
 Armature current.

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Electrical Machines
The coil spam

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

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