Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at over load.
 copper loss at half load.
  copper loss at any load.

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  improve and terminal voltage will rise .
 improve but terminal voltage will fall.
  worsen and terminal voltage will rise.
  worsen and terminal voltage will fall

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