Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 1600 W and 5000 W
 1600 W and 1250 W
 3200 W and 5200 W
 3200 W and 2500 W

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

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