Optical Fiber Communication MCQ Quiz - Multiple Choice Questions & Answers Page 2

11. Luminescence is because of

1. Photons emitted while excited electrons drops down
2. Knocking out of electrons by photons
3. Photons stimulated by photons
4. All

12. Fluorescence occurs within ...................

1. 10-5 s.
2. 10-5 ms.
3. 10-5 µs.
4. 10-5ns.

13. Electro-luminescence occurs in ...................

1. Electrical conductors
2. Electrical insulators
3. p-n junctions
4. all

14. Pyrometer works based on

1. Laser technology
2. Photo-conduction
3. Thermal emission
4. Tyndall effect

15. Solar cell works based on

1. Laser technology
2. Photo-conduction
3. Thermal emission
4. Tyndall effect

16. Optical fiber operates on the principle of

1. Total internal reflectance
2. Tyndall effect
3. Photo-electric effect
4. Laser technology