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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 30°
 36°
 18°

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 10V
 200V
 100V

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Equal to 1.
  High.
  Same as full load.
  Low.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 hysteresis loss.
 eddy current loss.
 friction and windage loss.
 copper loss.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 both A and B
 armature circuit
 none of above

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