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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
 16.
 8.
  4.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 1000 rpm
 3000 rpm
 750 rpm

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Electrical Machines
The shaft of induction motor should be

  flexible.
  hollow.
  any of these.
  stiff.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 1, 4
 1, 3
 2, 4
 2, 3

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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
In a transformer, hysteresis and eddy current losses depend upon

 load current
 both 2 and 3
 maximum flux density
 supply frequency

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