Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

  more than core loss.
 less than core loss.
 zero.
 equal to core loss.

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Electrical Machines
DC Motor

  dc series motor.
  dc compound motor.
  dc shunt with armature resistance control.
  dc shunt motor with field weakening.

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