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The number of excitations involved in the magnetic field system shown in the figure is:

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MPPGCL JE Electrical 28 April 2023 Shift 1 Official Paper
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  1. 0
  2. 1
  3. 2
  4. 3

Answer (Detailed Solution Below)

Option 3 : 2
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Detailed Solution

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The image depicts a rotating electrical machine with both a stator and a rotor winding, suggesting multiple excitations in the magnetic field system.

Excitations in the Magnetic Field System:

  • Stator Excitation (is): The stator winding carries a current (is) which produces a magnetic field.
  • Rotor Excitation (ir): The rotor winding also carries a current (ir) generating its magnetic field.


Since both the stator and rotor contribute to the magnetic field, there are two independent excitations in the system.

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