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Electrical Machines

Electrical Machines
Compensating winding is placed in the

All of these
 main field
 armature core
 pole shoe

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

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  high resistance and low reactance.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.
 either of these.
 field current on Y-axis and armature current on X-axis.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Bl2v.
 Blv.
 Bl2v2.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 16KVA
 4KVA
 20KVA

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