# Kennedy: MCQ in Introduction to Fiber Optic Technology

(Last Updated On: March 27, 2020) This is the Multiple Choice Questions in Chapter 18: Introduction to Fiber Optic Technology from the book Electronic Communication Systems by George Kennedy. 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.

1. What is the frequency limit of copper wire?

a. approximately 0.5 MHz

b. approximately 1.0 MHz

c. approximately 40 GHz

d. None of the above

Solution:

2. Approximately what is the frequency limit of the optical fiber?

a. 20 GHz

b. 1 MHz

c. 100 MHz

d. 40 MHz

Solution:

3. A single fiber can handle as many voice channel as

a. a pair of copper conductors

b. a 1500-pair cable

c. a 500-pair cable

d. a 1000-pair cable

Solution:

4. An incident ray can be defined as

a. a light ray reflected from a flat surface

b. a light ray directed toward a surface

c. a diffused light ray

d. a light ray that happens periodically

Solution:

5. The term dispersion describes the process of

a. separating light into its component frequencies

b. reflecting light from a smooth surface

c. the process by which light is absorbed by an uneven rough surface

d. light scattering

Solution:

6. Which of the following terms describes the reason that light is refracted at different angles?

a. Photon energy changes with wavelength

b. Light is refracted as a function of surface smoothness

c. The angle is determined partly by a and b

d. The angle is determined by the index of the materials

Solution:

7. The term critical angle describes

a. the point at which light is refracted

b. the point at which light becomes invisible

c. the point at which light has gone from the refractive mode to the reflective mode

d. the point at which light has crossed the boundary layers from one index to another

Solution:

8. The cladding which surrounds the fiber core

a. is used to reduce optical interference

b. is used to protect the fiber

c. acts to help guide the light in the core

d. ensures that the refractive index remains constant

Solution:

9. The reflective index number is

a. a number which compares the transparency of a material with that of air

b. a number assigned by the manufacturer to the fiber in question

c. a number which determines the core diameter

d. a term for describing core elasticity

Solution:

10. The terms single mode and multimode are best describes as

a. the number of fibers placed into a fiber-optic cable

b. the number of voice channels each fiber can support

c. the number of wavelengths each fiber can support

d. the index number

Solution:

11. The higher the index number

a. the higher the speed of light

b. the lower the speed of light

c. has no effect on the speed of light

d. the shorter the wavelength propagation

Solution:

12. The three major groups in the optical system are

a. the components, the data rate and response time

c. the transmitter, the cable, and the receiver

d. the source, the link, and the detector

Solution:

13. As light is coupled in a multipoint reflective device, the power is reduced by

a. 1.5 dB

b. 0.1 dB

c. 0.5 dB

d. 0.001 dB

Solution:

14. When connector losses, splice losses, and coupler losses are added, what is the final limiting factor?

a. Source power

b. Fiber attenuation

c. Connector and splice losses

d. Detector sensitivity

Solution:

15. The term responsivity as it applies to a light detector is best described as

a. the time required for the signal to go from 10 to 90 percent of maximum amplitude

b. the ratio of the diode output current to optical input power

c. the ratio of output current to output power

d. the ratio of output current to input current

Solution:

16. Loss comparisons between fusion splices and mechanical splices are

a. 1:10

b. 10:1

c. 20:1

d. 1:20

Solution:

17. The mechanical splice is best suited for

a. quicker installation under ideal conditions

b. minimum attenuation losses

c. field service conditions

d. situations in which cost of equipment is not a factor

Solution:

18. EMD is best describe by which statement?

a. 70 percent of the core diameter and 70% of the fiber NA should be filled with light

b. 70 percent of the fiber diameter and 70% of the cone of acceptance should be filled with light

c. 70 percent of input light should be measured at the output

d. 70 percent of the unwanted wavelengths should be attenuated by the fiber

Solution:

19. Which of the following cables will have the highest launch power capability?

a. 50/125/0.2

b. 85/125/0.275

c. 62.5/125/0.275

d. 100/140/0.3

Solution:

20. The term power budgeting refers to

a. the cost of cables, connectors, equipment, and installation

b. the loss of power due to defective components

c. the total power available minus the attenuation losses

d. the comparative costs of fiber and copper installations

Solution:

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

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