Free mock exam
Power Quality — Industrial Electrical Practice
Free topic-focused mock exam: all 15 questions on Power Quality, drawn from the wider Industrial Electrical 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
- 15
- Time limit
- 35 min
- Pass mark
- 70% · 11/15
- Question bank
- 15
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 real power to apparent power
- BThe ratio of line voltage to phase voltage
- CThe ratio of apparent power to reactive power
- DThe ratio of starting current to running current
Why: Power factor is the ratio of real power (kW) to apparent power (kVA).
02What causes low power factor in industrial installations?
- AInductive loads like motors
- BOversized supply cables
- CA high prospective fault current
- DPurely resistive heating loads
Why: Inductive loads (motors, transformers) draw reactive current causing lagging power factor.
03Why is low power factor problematic?
- AIt raises the supply frequency above 50Hz
- BIt reduces the prospective fault current
- CIt improves the efficiency of motors
- DIncreased losses, reduced capacity, potential charges
Why: Low PF increases losses, reduces system capacity, and may incur utility penalty charges.
Common questions
Is the Power Quality 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.
