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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
 0.7.
  0.54.

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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?

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

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 40 V
 20 V
 zero
 50 V

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 250 W
 300 W
 500 W
 400W

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  along neutral axis.
  along field axis.
  in none of above positions.

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Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Starter.
 Carbone brush.
 Armature.

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