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Electrical Machines

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

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

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 generation of voltage.
 development of torque.
 electromechanical energy conversion.
 commutation.

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Electrical Machines
Satisfactory commutation of DC machine requires

 smooth, concentric commutator properly undercut.
 brushes should be of proper grade and size.
 brushes should smoothly run in the holders.
All of these

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

  0.54 Ω.
 0.01 Ω.
 0.54 Ω.
 0.06 Ω.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

 1.
  slip X 59 / 3.
  slip X 50 / 3.
  slip X 69 / 3.

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 wave winding
 lap winding
 both 1 and 2

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MORE MCQ ON Electrical Machines

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