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Electrical Machines

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

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

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Cross magnetization
 Demagnetization
 Magnetization

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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
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
  failure of insulation between two turns of coil.
  any of above.
 failure of insulation between two commutator bars.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce armature heating.
 Reduce starting torque.
 Increase speed
 Increase acceleration duration.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
  0.573.
 0.443.
 0.649.

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