Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  cumulatively compounded.
  separately excited.
 differentially compounded.
  shunt connected.

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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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