Electrician Red Seal · Question
An electrician is commissioning a new production line with several variable frequency drives (VFDs). Measurements show a total active power of 250 kW and a total apparent power of 300 kVA. What is the overall power factor of the production line?
Power factor (PF) is calculated as the ratio of active power (P) to apparent power (S). Given P = 250 kW and S = 300 kVA, PF = P / S = 250 kW / 300 kVA ≈ 0.833.
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Question: An electrician is commissioning a new production line with several variable frequency drives (VFDs). Measurements show a total active power of 250 kW and a total apparent power of 300 kVA. What is the overall power factor of the production line?
Answer options:
- 0.75 ✅ 0.83
- 0.92
- 0.98
Correct answer: 0.83
Explanation: Power factor (PF) is calculated as the ratio of active power (P) to apparent power (S). Given P = 250 kW and S = 300 kVA, PF = P / S = 250 kW / 300 kVA ≈ 0.833. VFDs typically have a high displacement power factor but can introduce harmonic distortion which lowers the true power factor.
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