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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
None of these
 either GNA or MNA
 GNA

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 180o.
 90o.
 0o.
 dependent upon the load.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  single phase winding.
  heavy copper or aluminium bars placed in rotor slots.
  three phase winding.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ √P.
 T2 ∝ P3.
 T ∝ P.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor winding.
  Rotor mmf wave.
  Stator winding.
  Both rotor and stator winding.

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

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

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