Free mock exam
Fault Finding — Fibre Optics Practice
Free topic-focused mock exam: 30 random questions from a pool of 44 on Fault Finding, drawn from the wider Fibre Optics 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
- 44
Free, no sign-up. Retake as many times as you like — different questions each time.
Sample questions
01What is the most common cause of fibre optic connection failures?
- AConnector contamination
- BTemperature damage
- CFibre breaks
- DWrong fibre type
Why: Studies consistently show that connector contamination causes the majority (up to 80%) of fibre connection problems. Proper cleaning and inspection prevents most failures.
02What magnification is typically required for proper fibre end-face inspection?
- A10× to 50×
- BAny magnification works
- C1000× or higher
- D200× to 400×
Why: 200-400× magnification is standard for fibre inspection scopes, providing sufficient detail to see contamination in the core and cladding zones while maintaining adequate field of view.
03What does a 'gainer' event on an OTDR trace indicate?
- AA splice between fibres with different backscatter coefficients
- BA break causing total signal loss at that point
- CA macrobend allowing light to escape the core
- DA reflective connector saturating the receiver
Why: A gainer (apparent gain) occurs when testing from lower-backscatter fibre into higher-backscatter fibre. It's not real gain—bi-directional testing and averaging reveals true loss.
Common questions
Is the Fault Finding 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.
