Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3000 rpm.
  3600 rpm.
  1500 rpm.
  4000 rpm.

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

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

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