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Electrical Machines

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

 GNA
 MNA
 either GNA or MNA
None of these

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Series motor.
  Shunt motor.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  under commutation.
  any of the above.
 over commutation.
  too rapid reversal of current.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  rotor at slip rings.
None of these
  stator phases of the motor.
  starting resistance in the starter.

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 reduction in main field flux
 commutation
 reduces the terminal voltage

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