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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  1/Ia.
  √Ia.
  Ia.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 proportionate to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
  same.
 inversely proportional to MVA rating of transformers.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 run at very high speed.
 run at very low speed.
 start haunting.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 decrease
 increase
 remain the same

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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?

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

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Electrical Machines
A DC compound motor has

 only series field winding.
 only shunt field winding.
 both shunt and series field winding.
 tertiary winding.

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