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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 (1/2)Fmax.
 3Fmax.
 Fmax.

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Electrical Machines
In case of IM the torque is

  directly proportional to slip2.
  inversely proportional to slip.
  directly proportional to slip.
  inversely proportional to √slip.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  increases the electrical resistivity of iron.
  increases the hysteresis loss.
  reduces the saturation magnetization.

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Electrical Machines
In DC generator, brushes are always placed along

 geometrical neutral axis.
 armature axis.
 load axis.
  magnetic neutral axis.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
 The armature current will reduce.
 DC Shunt Motor
  The motor will attain dangerously high speed.

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

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

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