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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P and Z.
  none of these.
  P.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is equal to internal angle θ.
  input power factor is unity.
  load angle is 45°.
  load angle is 0°.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
 15 HP.
  13 HP.
  10 HP.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 72°
 18°
 36°

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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

 0.01 Ω.
  0.54 Ω.
 0.06 Ω.
 0.54 Ω.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 768 V
 192 V
 384 V
 96 V

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