Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
All of these
 field current control
 armature circuit resistance control

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Electrical Machines
In a DC generator, the armature reaction results in

 demagnetization of centers of poles.
  demagnetization of leading & magnetization of trailing pole tip.
  magnetization of inter poles.
 magnetization of leading and demagnetization of trailing pole tip.

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