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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at lower speed.
 not run.
 run at normal speed.
 burn.

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Electrical Machines
Hysteresis loss is proportional to

 f2.
 f3.
 f1.5.
  f.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic no-load axis.
 Magnetically no-load armature co-ordinate.
  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 decrease.
 increase.
 None of above.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 rotor resistance
 supply frequency
 supply voltage
None of these

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

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

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MORE MCQ ON Electrical Machines

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