MCQs in Fiber Optics Communications Part II

(Last Updated On: December 8, 2017)

MCQs in Fiber Optics Communications - Part II

This is the Multiples Choice Questions Part 2 of the Series in Fiber Optics Communications as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

Online Questions and Answers Topic Outline

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

MCQs in Fiber Optics Communications Series

Following is the list of multiple choice questions in this brand new series:

Optical Fiber Communications MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI

Continue Practice Exam Test Questions Part II of the Series

51. Which of the following is not a common application of fiber-optic cable?

  • a. Computer networks
  • b. Long-distance telephone systems
  • c. Closed circuit TV
  • d. Consumer TV

52. Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle?

  • a. Less than
  • b. Grater than
  • c. Equal to
  • d. Zero

53. The operation of the fiber-optic cable is based on the principle of

  • a. Refraction
  • b. Reflection
  • c. Dispersion
  • d. Absorption

54. Which of the following is not a common type of fiber-optic cable?

  • a. Single-mode step-index
  • b. Multimode graded-index
  • c. Single-mode graded-index
  • d. Multimode step-index

55. Cable attenuation is usually expressed in terms of

  • a. Loss per foot
  • b. dB/km
  • c. intensity per mile
  • d. voltage drop per inch

56. Which of the cable length has the highest attenuation?

  • a. 1 km
  • b. 2 km
  • c. 95 ft
  • d. 5500 ft

57. The upper pulse rate and information carrying capacity of a cable is limited by

  • a. Pulse shortening
  • b. Attenuation
  • c. Light leakage
  • d. Modal dispersion

58. The core of a fiber optic cable is made of

  • a. Air
  • b. Glass
  • c. Diamond
  • d. Quartz

59. The core of a fiber optic is surrounded by

  • a. Wire braid shield
  • b. Kevlar
  • c. Cladding
  • d. Plastic insulation

60. The speed of light in plastic compared to the speed of light in air is

  • a. Slower
  • b. Faster
  • c. The same
  • d. Either lower or faster

61. Which of the following is not a major benefit of fiber-optic cable?

  • a. Immunity from interference
  • b. No electrical safety problems
  • c. Excellent data security
  • d. Lower cost

62. The main benefit of light-wave communications over microwaves or any other communications media is

  • a. Lower cost
  • b. Better security
  • c. Wider bandwidth
  • d. Freedom from interference

63. Which of the following is not part of the optical spectrum?

  • a. Infrafed
  • b. Ultraviolet
  • c. Visible color
  • d. X-rays

64. The wavelength of visible light extends from

  • a. 0.8 to 1.0 nm
  • b. 400 to 750 nm
  • c. 200 to 660 nm
  • d. 700 to 1200 nm

65. The speed of light is

  • a. 186,000 mi/h
  • b. 300 mi/h
  • c. 300,000 m/s
  • d. 300,000,000 m/s

66. Refraction is the

  • a. Bending of light waves
  • b. Reflection of light waves
  • c. Distortion of light waves
  • d. Diffusion of light waves

67. The ratio of speed of light in air to the speed of light in another substance is called the

  • a. Speed factor
  • b. Index of reflection
  • c. Index of refraction
  • d. Dielectric constant

68. A popular light wavelength in fiber-optic cable is

  • a. 0.7 um
  • b. 1.3 um
  • c. 1.5 um
  • d. 1.8 um

69. Which type of fiber optic cable is most widely used?

  • a. Single-mode step-index
  • b. Multimode step-index
  • c. Single-mode graded-index
  • d. Multimode graded-index

70. Which type of fiber-optic cable is the best for very high speed data?

  • a. Single-mode step-index
  • b. Multimode step-index
  • c. Single-mode graded-index
  • d. Multimode graded-index

71. Which type of fiber-optic cable has the least modal dispersion?

  • a. Single mode step-index
  • b. Multimode step-index
  • c. Single-mode graded-index
  • d. Multimode graded-index

72. Which of the following is not a factor in cable light loss?

  • a. Reflection
  • b. Absorption
  • c. Scattering
  • d. Dispersion

73. A distance of 8 km is the same as

  • a. 2.5 mi
  • b. 5 mi
  • c. 8 mi
  • d. 12.9 mi

74. A fiber-optic cable has a loss of 15 dB/km. The attenuation in a cable, 100 ft long is

  • a. 4.57 dB
  • b. 9.3 dB
  • c. 24 dB
  • d. 49.2 dB

75. Fiber-optic cables with attenuations of 1.8, 3.4, 5.9, and 18 dB are linked together. The total loss is

  • a. 7.5 dB
  • b. 19.8 dB
  • c. 29.1 dB
  • d. 650 dB

76. Which light emitter is preferred for high speed data in a fiber-optic system

  • a. Incandescent
  • b. LED
  • c. Neon
  • d. Laser

77. Most fiber-optic light sources emit light in which spectrum?

  • a. Visible
  • b. Infrared
  • c. Ultraviolet
  • d. X-ray

78. Both LEDs and ILDs operate correctly with

  • a. Forward bias
  • b. Reverse bias
  • c. Neither A or B
  • d. Either A or B

79. Single-frequency light is called

  • a. Pure
  • b. Intense
  • c. Coherent
  • d. Monochromatic

80. Laser light is very bright because it is

  • a. Pure
  • b. White
  • c. Coherent
  • d. Monochromatic

81. Which of the following is NOT a common light detector

  • a. PIN photodiode
  • b. Photovoltaic diode
  • c. Photodiode
  • d. Avalanche photodiode

82. Which of the following is the fastest light sensor

  • a. PIN photodiode
  • b. Photovoltaic diode
  • c. Phototransistor
  • d. Avalanche photodiode

83. Photodiodes operate property with

  • a. Forward bias
  • b. Reverse bias
  • c. Neither A or B
  • d. Either A or B

84. The product of the bit rate and distance of a fiber-optic system is 2 Gbits km/s. What is the maximum rate at 5 km?

  • a. 100 Mbits/s
  • b. 200 Mbits/s
  • c. 400 Mbits/s
  • d. 1000 Gbits/s

85. Which fiber-optic system is better?

  • a. 3 repeaters
  • b. 8 repeaters
  • c. 11 repeaters
  • d. 20 repeaters

86. An important requirement for successful transmission system using light

  • a. Powerful, reliable light source
  • b. Strong glass
  • c. Reliable, high cost transmission medium
  • d. Powerful regenerators

87. What is used to block light from a laser and let other light through

  • a. Neutral density
  • b. Color
  • c. Interference
  • d. Spatial

88. ________ is a light that can be coherent

  • a. Spontaneous emission
  • b. Monochromatic and in-phase
  • c. Narrow beam divergence
  • d. Monochromatic

89. Coherence of laser light is important for _________

  • a. Light propagation
  • b. Getting laser light to pass through air
  • c. Drilling holes
  • d. Holography

90. The ultrapure glass used to manufacture optical fibers is approximately ___pure

  • a. 99.9 %
  • b. 99.99 %
  • c. 99.999 %
  • d. 99.9999 %

91. In fiber optics, PCS stands for

  • a. Plastic-clad-silica
  • b. Polyethylene-clad-silica
  • c. Personal carrier system
  • d. Personal communication

92. How many longitudinal modes can fall within a laser’s gain bandwidth?

  • a. 2
  • b. 5
  • c. 9
  • d. No fixed limit, dependent on bandwidth and mode spacing

93. _________ is the result of photons of light that are absorbed by the atoms of the glass core molecules

  • a. Ion resonance absorption
  • b. Ultraviolet absorption
  • c. Infrared absorption
  • d. Absorption loss

94. In fiber optics, SCS stands for

  • a. Suppressed-clad-silicon
  • b. Silicon base-class-silica
  • c. Silica-clad-silica
  • d. Serial-clad-silicon

95. Human laser was developed by A. Javen at Bell laboratory in

  • a. 1960
  • b. 1962
  • c. 1963
  • d. 1964

96. What parameter of light detector determines the range or system length that can be achieved for a given wavelength?

  • a. Transit time
  • b. Spectral response
  • c. Dark current
  • d. Responsitivity

97. Dark current in light detectors is caused by

  • a. Thermally generated carriers in the diode
  • b. The absence of light input
  • c. Small leakage current
  • d. Its imperfection

98. What is the unit of responsitivity?

  • a. Ampere/volt
  • b. Ampere/watt
  • c. Watt/ampere
  • d. Volts/ampere

99. One of the following is not a characteristic of light detectors.

  • a. Responsitivity
  • b. Spectral response
  • c. Transmit time
  • d. Dispersion

100. What is the typical wavelength of light emitted from epitaxially grown LEDs?

  • a. 840 nm
  • b. 490 nm
  • c. 480 nm
  • d. 940 nm

Complete List of MCQs in Communications Engineering per topic

MCQs in Fiber Optics Communications Part II
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