Free mock exam
Design Principles — Level 3 Systems Design Practice
Free topic-focused mock exam: all 30 questions on Design Principles, drawn from the wider Level 3 Systems Design 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
- 30
- Time limit
- 35 min
- Pass mark
- 70% · 21/30
- Question bank
- 30
Free, no sign-up. Retake as many times as you like — the questions are reshuffled, with the answer order changed.
Sample questions
01The fundamental objective of electrical installation design is to provide:
- Acompliance with manufacturer instructions in place of BS 7671
- Bsafety and functionality at reasonable cost
- Cthe lowest possible installation cost above all other factors
- Dthe maximum number of circuits the supply can carry
Why: Design must balance safety, functionality and economic considerations while meeting the user’s requirements.
02BS 7671 Chapter 13 deals with:
- Ainspection and testing on completion
- Bthe assessment of general characteristics
- Cselection and erection of wiring systems
- Dfundamental principles of design
Why: Chapter 13 sets out the fundamental principles for electrical installation design.
03The design process must consider protection against:
- Amechanical damage and corrosion but not electrical faults
- Belectric shock, fire, thermal effects, overcurrent and voltage disturbances
- Celectric shock and fire only, other hazards being out of scope
- Dovercurrent alone, since other risks are covered by the supplier
Why: Comprehensive design addresses multiple hazards including shock, fire, thermal effects, overcurrent and voltage disturbances.
Common questions
Is the Design Principles 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.
