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Electrical Machines

Electrical Machines
The armature MMF waveform of a DC machine is

  pulsating.
  sinusoidal.
  triangular.
  rectangular.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor shunt regulator.
None of these
  Zener diode shunt regulator.
  Transistor series regulator.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
  same.
 proportionate to MVA rating of transformers.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
  10 HP.
  13 HP.
 15 HP.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the mass.
 to reduce the inductor.

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Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Field flux.
 Armature current Ia.
 Applied voltage.

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