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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 square wave.
 triangular wave.
 sine wave.

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 zero
 maximum
 infinite value
 any of the above

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 constant speed.
 less expensive.
 none of above.
 not suitable for rapidly changing loads.

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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
 2, 3, 6
 2, 4, 5, 6
 1, 2, 5

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  2 - 3 µF.
 5 - 10 F.
  1 - 2 µF.
 0.1 µF.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Hysteresis loss.
 Copper loss.
 Stray loss.
 Eddy current loss.

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