Free mock exam
Level 3 Fault Diagnosis Mock Exam
Free mock exam for Level 3 Electrical apprentices on Fault Diagnosis. 30 questions from a 380-question bank covering the logical fault-finding sequence, dead vs live testing, multifunction tester use, common fault types (high Zs, low IR, RCD nuisance tripping, broken neutral) and how each maps to EICR observation codes.
- Questions
- 30
- Time limit
- 35 min
- Pass mark
- 70% · 21/30
- Question bank
- 380
Free, no sign-up. Retake as many times as you like — different questions each time.
Sample questions
01What type of fault occurs when current flows directly between the line and neutral conductors through a path of negligible impedance?
- AEarth fault
- BShort circuit fault
- CHigh resistance joint
- DOpen circuit fault
Why: A short circuit fault occurs when current bypasses the normal load path through an unintended low resistance connection, causing excessive current flow.
02Which measurement result identifies an open circuit fault?
- AWarm cables along the run
- BReduced brightness at the lamp
- CA tripped MCB at the board
- DNo voltage at the load
Why: An open circuit fault breaks the current path completely, resulting in no voltage reaching the load equipment.
03What is the primary danger of a high resistance joint?
- ANo danger if protected by fuse
- BFire risk from overheating
- CVoltage drop only
- DImmediate circuit breaker trip
Why: High resistance joints generate heat when current flows through them (P=I²R), creating a significant fire risk as they may not be detected by protective devices.
Common questions
Is the Level 3 Fault Diagnosis mock exam free?
Yes, it is free with 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 as a qualification?
No. This is independent practice material and does not award a qualification, card or certificate. Where a subject has a formal qualification or card, you gain it through an approved provider.