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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 dependent upon the load.
 180o.
 90o.

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Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f3.
 f2.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 None of these.
 Increase.
 Remains same.
  Decrease.

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 3, 4, 5
 1, 2, 5
 2, 4, 5, 6
 2, 3, 6

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Electrical Machines
Short circuiting is caused in the armature winding due to

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

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous motor.
  asynchronous generator.
  asynchronous motor.
  synchronous generator.

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MORE MCQ ON Electrical Machines

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