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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
All of these
 radiation.
 conduction.

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

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

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 90°
 0°
 Greater than 90°
 less than 90°

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 40 V
 50 V
 zero
 20 V

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

  reactance voltage.
 armature reaction.
 presence of commutator.
 high resistance of carbon brushes.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
  Shunt.
 Series.
 Compound (cummolative).

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