Free mock exam
Advanced Calculations — Level 3 Electrical Science Practice
Free topic-focused mock exam: all 15 questions on Advanced Calculations, 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
- 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 the voltage drop formula for single-phase AC circuits?
- AVd = I × (R sin φ + X cos φ) × L
- BVd = I × (R + X) × L regardless of power factor
- CVd = I × R × L only, ignoring reactance
- DVd = I × (R cos φ + X sin φ) × L
Why: For AC circuits, voltage drop includes both resistive and reactive components: Vd = I × (R cos φ + X sin φ) × L, accounting for power factor.
02What is the maximum permitted voltage drop for power circuits in BS 7671?
- A10%
- B4%
- C2%
- D5%
Why: BS 7671 recommends maximum 5% voltage drop from origin to load (3% for lighting, 5% for other circuits) to ensure proper equipment operation.
03A cable has (mV/A/m) value of 7.3. What is voltage drop for 30A over 25m?
- A5.48V
- B0.548V
- C547.5V
- D54.75V
Why: Vd = (mV/A/m) × I × L / 1000 = 7.3 × 30 × 25 / 1000 = 5.475V ≈ 5.48V
Common questions
Is the Advanced Calculations 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.
