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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?

The load current decreases (C) 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?

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

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

The available useful power decreases (C) Signup and view all the answers

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

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

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

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

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

KVA (D) Signup and view all the answers

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

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

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