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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 1000 ohms.
  Low.
 Infinitely large.

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.54 Ω.
 0.01 Ω.
 0.06 Ω.
  0.54 Ω.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf
 uneven air-gap length
 component of armature mmf along field axis

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced iron loss.
  Decrease in weight/KVA.
 Increase in weight/KVA.
 Reduced copper loss.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power factor.
  Improve power level.
  Improve voltage level.
  Improve current level.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 three.
 four.
 two.

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