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# MCQ in Fiber Optics Communications Part 1 | ECE Board Exam

This is the Multiples Choice Questions Part 1 of the Series in Fiber Optics Communications as one of the Communications Engineering topics. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize yourself with each and every question compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic Systems and Technologies, Communications Books, Journals, and other Communications References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Principles of Light Transmission
• MCQ in Types of Light Sources, Laser, LED
• MCQ in Light Detectors
• MCQ in Modulation and Waveform
• MCQ in System Design
• MCQ in General application
• MCQ in System Bandwidth
• MCQ in Splicing Techniques

#### Start Practice Exam Test Questions Part 1 of the Series

Choose the letter of the best answer in each questions.

1. Founded the wave theory of light

a. Francesco Grimaldi

b. Edward Appleton

c. James Clerk Maxwell

d. Christian Huygens

Solution:

2. Proposed the use of clad glass fiber as a dielectric waveguide

a. Karpon and Keck

b. Karpon and Bockham

c. Bockham and Kao

d. Kao and Keck

Solution:

3. Developed the first laser

a. Charles Townes

b. Theodore Maiman

c. Gordon McKenzie

d. Albert Einstein

Solution:

4. The band of light wavelengths that are too long to be seen by the human eye

a. Amber

b. Visible

c. Infrared

d. Ultraviolet

Solution:

5. The band of light wavelengths that are too short to be seen by the human eye

a. Amber

b. Visible

c. Infrared

d. Ultraviolet

Solution:

6. Which color has the shortest wavelength of light?

a. Red

b. Yellow

c. Blue

d. Green

Solution:

7. What generates a light beam of a specific visible frequency?

a. Laser

b. Maser

c. Infrared

d. Flashlight

Solution:

8. Which of the following materials is sensitive to light?

a. Photoresist

b. Photosensitive

c. Light Sensitive

d. Maser

Solution:

9. The core of an optical fiber has a

a. Lower refracted index than air

b. Lower refractive index than the cladding

c. Higher refractive index than the cladding

d. Similar refractive index with the cladding

Solution:

10. Is the different angle of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitted.

a. Acceptance angle

b. Modes

c. Sensors

d. Aperture

Solution:

11. The loss in signal power as light travels down a fiber is called

a. Dispersion

b. Scattering

c. Absorption

d. Attenuation

Solution:

12. The bandwidth of optical fiber

a. 900M Hz

b. 900 PHz

c. 900 THz

d. 900 EHz

Solution:

13. If a mirror is used to reflect light, the reflected light angle is ____ as the incident angle

a. Smaller

b. Larger

c. The same

d. Independent

Solution:

14. What is a specific path the light takes in an optical fiber corresponding to a certain angle and number of reflection

a. Mode

c. Numerical Aperture

d. Dispersion

Solution:

15. Is the width of the range of wavelengths emitted by the light source

a. Bandwidth

b. Chromatic Dispersion

c. Spectral width

d. Beamwidth

Solution:

16. Which theory states that the light wave behaves as if it consists of many tiny particles?

a. Huygenโs theory

b. Wave theory of light

c. Nyquist theory

d. Quantum theory

Solution:

17. Fiber optic cables operate at frequencies near

a. 20 MHz

b. 200 MHz

c. 2G Hz

d. 800 THz

Solution:

18. When a beam of light enters one medium from another, which quantity will not change?

a. Direction

b. Speed

c. Frequency

d. Wavelength

Solution:

19. Dispersion is used to describe the

a. Splitting of white light into its component colors

b. Propagation of light in straight lines

c. Bending of a beam of light when it goes from one medium to another

d. Bending of a beam light when it strikes a mirror

Solution:

20. Luminance efficiency is minimum for a

a. Fluorescent tube

b. High wattage light bulb

c. Mercury vapor lamp

d. Low wattage light bulb

Solution:

21. An object farther from a converging lens than its focal point always has a/an _____ image.

a. Inverted

b. The same in size

c. Virtual

d. Smaller size

Solution:

22. An object nearer to a converging lens than its focal point always has a/an ______ image.

a. Inverted

b. The same in size

c. Virtual

d. Smaller size

Solution:

23. The real image formed by a spherical mirror is ____ relative to its object

a. Erect

b. Inverted

c. Smaller

d. Larger

Solution:

24. The wavelength of light has no role in

a. Diffraction

b. Interference

c. Polarization

d. Reflection

Solution:

25. Longitudinal waves do not exhibit

a. Polarization

b. Refraction

c. Reflection

d. Diffraction

Solution:

26. ________ dispersion is caused by the difference in the propagation times of light rays that take different paths down a fiber.

a. Material dispersion

b. Wavelength dispersion

c. Modal dispersion

d. Delay dispersion

Solution:

27. What is the average insertion loss of fusion splice in fiber optics?

a. 0.09 dB

b. 0.9 dB

c. 0.19 dB

d. 0.009 dB

Solution:

28. What is the insertion loss of connector-type splices for a single mode fiber optics?

a. 0.51 dB

b. 0.31 dB

c. 0.49 dB

d. 0.38 dB

Solution:

29. What is the lifetime of LEDs?

a. 200,000 minutes

b. 200,000 hours

c. 150,000 minutes

d. 150,000 hours

Solution:

30. What is the lifetime of ILDs?

a. 50,000 hours

b. 75,000 hours

c. 100,000 hours

d. 125,000 hours

Solution:

31. Photodiodes used as fiber optic directors are

a. Unbiased to generate a voltage same as a solar cell

b. Forward bias

c. Reversed bias

d. Thermoelectrically cooled

Solution:

32. What type of fiber has the highest modal dispersion?

a. Step-index multimode

c. Step-index single mode

Solution:

33. Laser light is ______ emission.

a. Coherent

b. Stimulated

c. Spontaneous

d. Coherent and stimulated

Solution:

34. A dielectric waveguide for the propagation of electromagnetic energy at light frequencies

a. Stripline

b. Microstrip

c. Laser beam

d. Fiber optics

Solution:

35. Is a non-coherent light source foe optical communications system.

a. ILD

b. LED

c. APD

d. PIN Diode

Solution:

36. Which type of laser is the simplest to modulate directly by changing its excitation?

a. Semiconductor

b. Ruby

c. Helium-neon

d. Neodymium-YAG

Solution:

37. Which laser emits light in the visible range 400 to 700 nm?

a. Argon-ion

b. Nitrogen

c. Carbon-dioxide

d. Neodymium-YAG

Solution:

38. Which is the proper measurement of average power emitted by a pulsed laser?

a. Energy x time

b. Pulse energy x repetition rate

c. Pulse energy / repetition rate

d. Peak power x pulse length

Solution:

39. What is the photon energy for an infrared wave with frequency of 10^12 Hz?

a. 10.6 x 10^34 joules

b. 6.63 x 10^-34 joules

c. 6.63 x 10^-22 joules

d. 10.6 x 10^22 joules

Solution:

40. A positive lens with a focal length of 10 cm forms a real image of an object 20 cm away from the lens. How far is the real image from the lens?

a. 5 cm

b. 10 cm

c. 15 cm

d. 20 cm

Solution:

41. Which of the following factor does not harm laser efficiency?

a. Atmospheric absorption

b. Excitation energy not absorbed

c. Problems in depopulating the lower laser level

d. Inefficiency in populating the upper laser level

Solution:

42. Which of the following contributes to the broadening of laser emission bandwidth?

a. Doppler shift of moving atoms and molecules

b. Amplification within the laser medium

c. Coherence of the laser light

d. Optical pumping of the laser transition

Solution:

43. The first laser emitted

a. Pulses of 694 nm red light

b. A continuous red beam

c. Pulses of white light from a helical flash lamp

d. Spontaneous emission

Solution:

44. What is the stage of the sand becoming a silicon?

a. Liquid

b. Gas

c. Molten

d. Hot

Solution:

45. Which of the following is used as an optical transmitter on the Fiber Optical Communications?

a. APD

b. LSA diode

c. PIN diode

d. LED

Solution:

46. Which of the following is used as an optical receiver in fiber optics communications

a. APD

b. Tunnel diode

c. Laser diode

d. LED

Solution:

47. The numerical aperture of a fiber if the angle of acceptance is 15 degrees, is

a. 017

b. 0.26

c. 0.50

d. 0.75

Solution:

48. The inner portion of the fiber cable is called

b. Coating

c. Inner conductor

d. Core

Solution:

49. Which type of laser is the simplest to modulate directly by changing its excitation?

a. Semiconductor

b. Ruby

c. Helium-neon

d. Neodymium-YAG

Solution:

50. The laser frequency when the light has the wavelength 800 nm is

a. 375 x 10^12 Hz

b. 475 x 10^15 Hz

c. 375 x 10^9 Hz

d. 375 x 10^18 Hz

Solution:

### Complete List of MCQ in Communications Engineering per topic

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