Which of the following is a small DC shunt or compound dynamo fixed at one end of an alternator shaft?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 3
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  1. Exciter
  2. Stator
  3. Caged rotor
  4. Salient-pole rotor

Answer (Detailed Solution Below)

Option 1 : Exciter
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The rotor or the field coils in a generator produce the magnetic flux that is essential to the production of the electric power. The rotor is a rotating electromagnet that requires a DC electric power source to excite the magnetic field. This power comes from an exciter.

  • Shunt generator can be used as exciter.
  • DC generator is coupled to the same shaft as the rotor. Therefore, when the rotor rotates this exciter produces the power for the electromagnet.
  • Control of the exciter output is done by varying the field current of the exciter.
  • This output from the exciter then controls the magnetic field of the rotor to produce a constant voltage output by the generator.
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