Free mock exam
Power Factor — Level 3 Electrical Science Practice
Free topic-focused mock exam: all 25 questions on Power Factor, drawn from the wider Level 3 Electrical Science bank. 35-minute timer, 70% to pass, worked explanation on every question. Use this when you've taken the full mock once and want to drill the topics you got wrong.
- Questions
- 25
- Time limit
- 35 min
- Pass mark
- 70% · 18/25
- Question bank
- 25
Free, no sign-up. Retake as many times as you like — the questions are reshuffled, with the answer order changed.
Sample questions
01What is power factor?
- AThe ratio of apparent power to true power
- BThe ratio of reactive power to true power
- CThe ratio of reactive power to apparent power (sin φ)
- DThe ratio of true power to apparent power (cos φ)
Why: Power factor is the ratio of true power (W) to apparent power (VA): PF = P/S = cos φ. It indicates how effectively power is used.
02What is the ideal power factor?
- A0.5
- B0
- C1.0 (unity)
- D-1.0
Why: Unity power factor (1.0) is ideal - all power supplied does useful work. Current and voltage are in phase.
03What type of load causes lagging power factor?
- AInductive
- BLED lights
- CCapacitive
- DResistive
Why: Inductive loads (motors, transformers, inductors) cause lagging power factor because current lags behind voltage.
Common questions
Is the Power Factor mock exam free?
Yes — 100% free, no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.
Can I retake the mock exam?
Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.
Does this count towards the real qualification?
No — this is independent practice material. To gain the actual qualification you need to sit the official assessment through an approved provider.
