Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  500 rpm.
  3000 rpm.
  600 rpm.

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

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

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