Below are the answers key for Multiple Choice Questions in Chapter 18: Introduction to Fiber Optic Technology from the book Electronic Communication Systems by George Kennedy. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. b. approximately 1.0 MHz
2. a. 20 GHz
3. b. a 1500-pair cable
4. b. a light ray directed toward a surface
5. a. separating light into its component frequencies
6. d. The angle is determined by the index of the materials
7. c. the point at which light has gone from the refractive mode to the reflective mode
8. c. acts to help guide the light in the core
9. a. a number which compares the transparency of a material with that of air
10. c. the number of wavelengths each fiber can support
11. a. the higher the speed of light
12. d. the source, the link, and the detector
13. c. 0.5 dB
14. d. Detector sensitivity
15. b. the ratio of the diode output current to optical input power
16. a. 1:10
17. c. field service conditions
18. a. 70 percent of the core diameter and 70% of the fiber NA should be filled with light
19. d. 100/140/0.3
20. c. the total power available minus the attenuation losses
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