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Fiber optics installer / technician practice test

51 free practice questions for this exam, each with the reason for the answer and where to look it up.

Low voltage and structured cabling: practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

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51 questions for this exam

About the exam

ExamFiber optics installer / technician
Who runs itETA, FOA
WhereUnited States

Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.

Sample questions

What jacket colour identifies indoor OM3 or OM4 laser-optimised multimode cable?

  1. Orange
  2. Aqua
  3. Yellow
  4. Lime green
Show the answer

B. Aqua

OM3 and OM4 are jacketed aqua. Orange is used for the older OM1 and OM2 multimode, yellow for single-mode and lime green for OM5 wideband multimode.

Reference: ANSI/TIA-598, fibre colour coding

An extension ladder is set against a wall with its top support point 16 ft above the ground. How far from the wall should the base be placed?

  1. 2 ft
  2. 6 ft
  3. 4 ft
  4. 8 ft
Show the answer

C. 4 ft

The base is set out one quarter of the working length of the ladder, the 4-to-1 rule, which for a support point about 16 ft up is 4 ft. Closer than that and the ladder can tip backwards; farther and the base can slide out.

Reference: OSHA 29 CFR 1926.1053(b)(5)(i)

Which pair of wavelengths is normally used to test and operate single-mode fibre?

  1. 1310 nm and 1550 nm
  2. 850 nm and 1300 nm
  3. 650 nm and 850 nm
  4. 850 nm and 1550 nm
Show the answer

A. 1310 nm and 1550 nm

Single-mode systems operate and are tested at 1310 and 1550 nm. 850 and 1300 nm are the multimode windows, and 650 nm is visible red light used by fault locators.

Reference: ANSI/TIA-568.3; TIA-526-7

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