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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 demagnetization
 cross magnetization
All of these
 magnetization

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  single phase induction motor.
  high torque motor.
  low horse power motor.

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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
 component of armature mmf along field axis
 non-sinusoidal nature of armature mmf
 uneven air-gap length

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
 20 N.
  None of these.
  15 N.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  uneven air gap.
  poor lubrication.
  overheating of winding.
  overload.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.
 6000 W, 7000 W.

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