Power Factor Improvement

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Questions and Answers

What is the condition for minimum losses to occur?

  • Power factor is leading
  • Q = 1
  • Q = 0 (correct)
  • Current density is maximum

What is the formula to calculate the percentage reduction in losses when the power factor is improved?

  • (Original power factor / Improved power factor)^2 × 100
  • (Original power factor / Improved power factor) × 100
  • (1 - (Original power factor / Improved power factor)^2) × 100 (correct)
  • (1 - Original power factor / Improved power factor) × 100

What is the relationship between the current density and the cross-sectional area of a conductor?

  • Current density is directly proportional to the cross-sectional area
  • Current density is inversely proportional to the cross-sectional area (correct)
  • Current density is independent of the cross-sectional area
  • Current density is proportional to the square root of the cross-sectional area

What happens to the load current when the power factor is improved to a higher value?

<p>The load current decreases (C)</p> Signup and view all the answers

What is the formula to calculate the percentage reduction in conductor cross-sectional area when the power factor is improved?

<p>(1 - (Original power factor / Improved power factor)^2) × 100 (D)</p> Signup and view all the answers

What is the effect of low power factor on the available useful power?

<p>The available useful power decreases (C)</p> Signup and view all the answers

What is the relationship between the reactive power and the useful power?

<p>P = sqrt(kVA^2 - Q^2) (A)</p> Signup and view all the answers

What is the benefit of improving the power factor in terms of system capacity?

<p>It releases more capacity to other customers (D)</p> Signup and view all the answers

What is the unit of measurement for the capacity of a system or apparatus?

<p>KVA (D)</p> Signup and view all the answers

What is the effect of power factor correction on the system?

<p>It reduces the system losses and releases more capacity to other customers (C)</p> Signup and view all the answers

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