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

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

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Electrical Machines
An ideal synchronous motor has no starting torque because

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

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