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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.05.
  0.905.
 1.1.
 20.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 1
 2
 0

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 efficiency.
 starting torque.
 running torque.
 speed regulation.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 polarities are properly connected
 percentage impedances are equal
 turn- ratios are exactly equal
 KVA ratings are equal

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  sR2 = X2.
  R2 = s2X2.
  R2 = s2X2.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

None of these
 both 1 and 2
 excitation power only
 power due to saliency or reluctance only

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