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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?

 20.
 1.1.
  0.05.
  0.905.

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Electrical Machines
The output power of any electrical motor is taken from the

 Armature.
 Motor frame.
 Field.
 Coupling mounted on the shaft.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum
 Ra minimum and Rf minimum

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

  reactance voltage induced in the coil.
 armature emf.
  coil resistance.
None of these

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Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 AC and DC
 DC
 AC

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
 lagging power factor
 leading power factor
All of these

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