The normally excited alternator works at __________.

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MPPGCL JE Electrical 28 April 2023 Shift 2 Official Paper
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  1. lagging power factor
  2. leading power factor
  3. unity power factor
  4. zero power factor

Answer (Detailed Solution Below)

Option 3 : unity power factor
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Detailed Solution

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Concept

A synchronous generator or alternator is capable of operating at all types of power factors, i.e. either UPF, leading, or lagging power factor.

  • Leading power factor: If field excitation is such that Eb < V, the alternator is said to be under-excited and it has a leading power factor.
  • Lagging power factor: If field excitation is such that Eb > V, the alternator is said to be over-excited and has a lagging power factor.
  • Unity power factor: If field excitation is such that Eb = V, the alternator is said to be normally excited.


The V-curve for synchronous generator or alternator is shown below

Altenator V curve

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