Optical Fiber Communication MCQ (Part-1)

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Optical Fiber Communication MCQ

Optical Fiber Communication MCQ, Multiple Choice Questions on Optical Fiber Communication, Fiber Optics MCQ, GATE questions on Optical Fiber Communication, Objective Questions with answers on Fiber Optics, Objective Questions with answers on Optical Fiber Communication

Multiple Choice Questions

Q.1. In optical fiber communications, the signal source is ________ waves.

  • Light
  • Infrared
  • Radio
  • Very low-frequency

Answer: Light

Q.2. Which one of the following is not a guided medium of transmission?

  • Fiber–Optic cable
  • Coaxial cable
  • Twisted-pair cable
  • The atmosphere

Answer: The atmosphere

Q.3. An operating environment has many high-voltage devices. What would be the best medium of transmission?

  • The atmosphere
  • Twisted-pair cable
  • Optical fiber
  • Coaxial cable

Answer: Optical fiber

Q.4. Which of these converts the electrical signal to optical signals?

  • Optical photo detectors
  • Demultiplexers
  • Multiplexers
  • Optical modulators

Answer: Optical modulators

Q.5. Fiber optic system has three basic components, in the order. They are:

  • light guide, light source, light detector
  • light source, light guide, light detector
  • light detector, light source, light guide
  • light guide, light detector, light source

Answer: light source, light guide, light detector

Q.6. In optical fiber, the outer layer is _________ and inner layer is ________________ .

  • core, cladding
  • cladding, core
  • transmit, reflect
  • reflect, transmit

Answer: cladding, core

Q.7. Optical fiber cables are highly immune to EMI because information is carried by:

  • light
  • electrical means
  • magnetic means
  • acoustic means

Answer: light

Q.8. Which one of the following is based on laser beam technology?

  • Magnetic tape
  • Terminals
  • Optical disks
  • Keyboards

Answer: Optical disks

Q.9. _____________ method allows a large number of selectable and independent user channels to coexist on a single optical fiber link?

  • PCM
  • FDM
  • TDM
  • CDM

Answer: FDM

Q.10. Usually various types of transmission media are categorized as:

  • Metallic or nonmetallic
  • Guided or unguided
  • Determinate or indeterminate
  • Fixed or unfixed

Answer: Guided or unguided

Q.11. _________ is a guided medium.

  • Microwave
  • Radio
  • Fiber-optic cable
  • Atmosphere

Answer: Fiber-optic cable

Q.12. Which mechanism is used in Laser Technology for generation of light?

  • Dispersion
  • Absorption
  • Stimulated Emission
  • Spontaneous Emission

Answer: Stimulated Emission

Q.13. Optical splice provides a connection between

  • transmitter to fiber
  • receiver to fiber
  • fiber to fiber
  • fiber to repeater

Answer: fiber to fiber

Q.14. Optical fibers are highly immune to EMI. Which one of the following four statements justifies it?

  • They transmit signals in as light rather than electric current.
  • They are readily shielded by outer conductors in cable.
  • They are too small for magnetic fields to introduce current in them.
  • Magnetic fields cannot penetrate the glass of the fiber.

Answer: They transmit signals in as light rather than electric current.

Q.15. In an optical fiber, the fiber core ____________ the cladding.

  • is denser than
  • has the same density as
  • is less dense than
  • is another name for

Answer: is denser than

Q.16. The material used for fabrication of inner core of an optical fiber is

  • glass or plastic
  • bimetallic
  • copper
  • liquid

Answer: glass or plastic

Q.17. Unlike wired media, optical fibers are highly resistant to

  • refraction
  • low-frequency transmission
  • electromagnetic interference
  • high-frequency transmission

Answer: electromagnetic interference

Q.18. The light is propagated within the fiber core by the phenomenon

  • total internal reflection at core-cladding intersection
  • refraction at core-cladding intersection
  • total internal reflection at the outer surface of the cladding
  • change in the velocity of light within the fiber core

Answer: total internal reflection at core-cladding intersection

Q.19. A step-index fiber has specified parameters for refractive index of fiber core and cladding as 1.50 and 1.46, respectively. Its numerical aperture is

  • 0.344
  • 0.156
  • 0.486
  • 0.244

Answer: 0.344

Q.20. A step-index fiber has specified parameters for refractive index of fiber core and cladding as 1.50 and 1.33, respectively. Its acceptance angle will be approximately

  • 25°
  • 20°
  • 15°
  • 10°

Answer: 15°

Q.21. Consider a ray of light propagating from one medium to another medium having different indexes of refraction. If the incidence angle is greater than the specified critical angle, then _______  occurs.

  • reflection
  • refraction
  • diffraction
  • scattering

Answer: reflection

Q.22. When the incidence angle is ___________ the specified critical angle, the light rays bend along the intersection line of two different mediums of propagation.

  • more than
  • less than
  • equal to
  • not related with

Answer: equal to

Q.23. In ____________ profile optical fibers, the propagation of light rays is almost horizontal provided the low-refractive index fiber core has relatively smaller diameter as compared with those of other types of optical fibers.

  • multimode step-index
  • multimode graded-index
  • multimode single-index
  • single-mode

Answer: single-mode

Q.24. Dispersion (i.e., distortion in the transmitted optical pulse) is maximum in _________ type of optical fibers.

  • Multimode step-index
  • Multimode graded-index
  • Multimode single-index
  • Single-mode

Answer: Multimode step-index

Q.25. In __________ type of optical fiber cables, the density of the fiber core varies.

  • multimode step-index
  • multimode graded-index
  • multimode single-index
  • single-mode

Answer: multimode graded-index

Q.26. In optical fibers, the index of refraction in the fiber core is always

  • greater than that of cladding
  • less than that of cladding
  • equal to that of cladding
  • not at all related with that of cladding

Answer: greater than that of cladding

Q.27. For single-mode step index fibers, V-number should be less than

  • 2.4
  • 2.8
  • 4.2
  • 8

Answer: 2.4

Q.28. Which one of the following types does not exist in optical fibers?

  • single-mode step-index
  • single-mode graded-index
  • multimode step-index
  • multimode graded-index

Answer: single-mode graded-index

Q.29. The essential condition for total internal reflection to take place within the optical fiber is when the incidence angle exceeds the specified value of

  • critical angle
  • refraction angle
  • reflection angle
  • acceptance angle

Answer: critical angle

Q.30. The rays which do not intersect the core axis are called

  • meridional rays
  • radial rays
  • helical rays
  • skew rays

Answer: skew rays

Optical Fiber Communication MCQ (Part-2)

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