Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
 Shunt motor with interpoles.
  Series motor without interpoles.
 Series motor with interpoles.

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Electrical Machines
Armature reaction in a DC machine

  makes an angle of 90° with the main pole axis.
 makes an angle with the main pole axis which is load dependent.
 is in the same direction as the main poles.
 is in direct opposition to the main poles.

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