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# Blake: MCQ in Fiber Optics

This is the Multiple Choice Questions in Chapter 24: Fiber Optics from the book Electronic Communication Systems by Roy Blake. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

#### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

MULTIPLE CHOICE

1. Compared to the core, the index of refraction of the cladding must be:

a. the same

b. greater

c. less

d. doesn’t have an index of refraction

Solution:

2. Fiber-optic cables do not:

a. carry current

b. cause crosstalk

c. generate EMI

d. all of the above

Solution:

3. Single-mode fiber is made from:

a. glass

b. plastic

c. both a and b

d. none of the above

Solution:

4. Fiber-optic cable cannot be used:

a. in an explosive environment

b. to connect a transmitter to an antenna

c. to isolate a medical patient from a shock hazard

d. none of the above

Solution:

5. A single-mode cable does not suffer from:

a. modal dispersion

b. chromatic dispersion

c. waveguide dispersion

d. all of the above

Solution:

6. Scattering causes:

a. loss

b. dispersion

c. intersymbol interference

d. all of the above

Solution:

7. The loss in single-mode fiber-optic cable due to the glass is about:

a. 40 dB per km

b. 4 db per km

c. 0.4 dB per km

d. zero loss

Solution:

8. The loss in single-mode fiber-optic cable due to a splice is about:

a. 0.02 dB

b. 0.2 db

c. 1 dB

d. 3 dB

Solution:

9. The loss in single-mode fiber-optic cable due to a connector is about:

a. 0.02 dB

b. 0.2 db

c. 1 dB

d. 3 dB

Solution:

10. Which of the following is a type of fiber connector:

a. ST

b. SC

c. SMA

d. all of the above

Solution:

11. The quantum of light is called:

a. an erg

b. an e-v

c. a photon

d. a phonon

Solution:

12. LASER stands for:

a. Light Amplification by Simulated Emission of Radiation

b. Light Amplification by Stimulated Emission of Radiation

c. Light Amplification by Simulated Emitted Rays

d. Light Amplification by Stimulated Emitted Rays

Solution:

13. APD stands for:

a. Avalanche Photodiode

c. Avalanche Photo Detector

Solution:

14. In a PIN diode, leakage current in the absence of light is called:

a. baseline current

b. zero-point current

c. dark current

d. E-H current

Solution:

15. For a light detector, responsivity is measured in:

a. amps per watt

b. ยตW per amp

c. mA per joule

d. ยตsec per ยตW

Solution:

COMPLETION

1. In the core, the angle of incidence equals the angle of ____________________.

Solution:

2. The core is surrounded by the ____________________.

Solution:

3. The ____________________ angle is where refraction changes to reflection.

Solution:

4. An electron-volt is a measure of ____________________.

Solution:

5. The numerical aperture is the ____________________ of the angle of acceptance.

Solution:

6. Optical fiber relies on total ____________________ reflection.

Solution:

7. Chromatic dispersion is also called ____________________ dispersion.

Solution:

8. With optical fiber, ____________________ light is more common than visible light.

Solution:

9. In multimode fiber, ____________________ index has less dispersion than step index.

Solution:

10. For laser diodes, the term ____________________ is used instead of bandwidth.

Solution:

11. Dispersion can be expressed in units of ____________________ rather than bandwidth.

Solution:

12. ____________________ interference is when one pulse merges with the next pulse.

Solution:

13. The optical fiber is free to move around in a ____________________ cable.

Solution:

14. The optical fiber is not free to move around in a ____________________ cable.

Solution:

15. A ____________________ is a short length of fiber that carries the light away from the source.

Solution:

16. Good connections are more critical with ____________________-mode fiber.

Solution:

17. A ____________________ diode is the usual light source for single-mode cable.

Solution:

18. The quantum of light is called the ____________________.

Solution:

19. A ____________________ diode is the usual light detector for single-mode cable.

Solution:

20. For safety, you should never ____________________ at the end of an optical fiber unless you know it is not connected to a light source.

Solution:

### Complete List of MCQ in Electronic Communication Systems by Blake

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