Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Frequency should be same
 Speed of alternators should be same
 Terminal voltage is same

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

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

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