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Electrical Machines

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

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

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Electrical Machines
Hysteresis loop represents the area of

 copper loss
 eddy current loss
 hysteresis loss
 total iron losses

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may run away.
 the starting torque becomes low.
 the starting current will be enormously high.
 the motor may not start.

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Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always unity.
 is always leading.
  depends on the power factor of the load.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.
 either of these.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 the use of compensating winding.
 the use drum winding.
 reactance voltage produced due to communication.

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MORE MCQ ON Electrical Machines

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