This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Fibre Optic Sensors”.
1. OTDR stands for _______________
a) Optical time domain reflectometer
b) Optical transfer data rate
c) Optical time data registers
d) None of the mentioned
Explanation: OTDR is the short form of optical time domain reflectometer.
2. Which of the following is not correct for fibre optic sensors?
a) Immune to electro magnetic interference
b) Immune to radiation hazard
c) Can be used in harsh environments
d) None of the mentioned
Explanation: All of the mentioned are qualities of fibre optic sensors.
3. Fluoride glass is used with __________
a) IR waves
b) UV rays
c) Normal light
d) All of the mentioned
Explanation: Flouride glass are suitable for IR rays of wavelength upto 3200 nm.
4. Silica glass of hydroxyl concentration can be used for ___________ of wavelength.
a) 100 nm to 250 nm
b) 250 nm to 800 nm
c) 800 nm to 1500 nm
d) 100 nm to 3400 nm
Explanation: Silica glass with hydroxyl concentration is used for wavelength 250 nm to 800 nm.
5. General spectral range for silica glass is _______________
a) Less than 200 nm
b) Between 200 nm to 2200 nm
c) Between 2000 nm to 5000 nm
d) Greater than 3000 nm
Explanation: General spectral range of silica glass is 200 nm to 2200 nm.
6. Epoxy material in fibre optics is intended for ________________
a) Better optical properties
b) Better reflection
c) Better sealing
d) Reducing noise
Explanation: Polished epoxy seal provides liquid and air tight seal.
7. Plastics optical cables can be used for ________________
a) Short range
b) Medium range of distance
c) Long range of distance
d) Very high range of distance
Explanation: Plastic optical cables are manufacturing for short range purposes.
8. Which of the following represents loss associated with glass fibres?
a) 3 dB/Km
b) 10 dB/Km
c) 0 dB/Km
d) 50 dB/Km
Explanation: Glass fibres have a net loss of 3 dB on every single kilometre.
9. Loss associated with plastic fibre is less than glass fibres.
Explanation: Loss associated with plastic fibre is about 100-1250 dB/Km and it is several times larger than glass fibres.
10. Cladding in glass fibre have high refractive index than core.
Explanation: Cladding in glass fibre is always kept at low refractive index than core.
Sanfoundry Global Education & Learning Series – Instrumentation Transducers.
To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers.