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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  run normally.
  make noise.
  not run.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 eddy current loss.
 both eddy current and hysteresis loss.
 ohmic loss.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Increase.
 Reduce.
 Oscillate around the normal speed.
 Remain unaltered.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Any where between 75 % and 90 %.
 Around 100 %.
 Around 90 %
 Less than 50 %

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid locking of the armature.
All of these
 to avoid over heating.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying the supply frequency.
  By varying supply voltage.
  By varying number of poles.
  Both (A) and (B).

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