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.
 equal to core loss.
 zero.

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Electrical Machines
An ideal synchronous motor has no starting torque because

 relative velocity between the stator and rotor mmf’s is zero.
 rotor winding is highly reactive.
 rotor is made up of salient poles.
  relative velocity between stator and rotor mmf’s is not zero.

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