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    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

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    Optical Fiber Communication MCQ (Part

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

    April 20, 2021 Optical Fiber Communication

    Optical Fiber Communication MCQ (Part-1)

    Optical Fiber Communication MCQ (Part-1) 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

    स्रोत : mcq.electronics-club.com

    A silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine(i) the critical angle at the core cladding interface,(ii) the numerical aperture for the fibre(iii) the acceptance angle in air for the fibre.

    Click here👆to get an answer to your question ✍️ A silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine(i) the critical angle at the core cladding interface,(ii) the numerical aperture for the fibre(iii) the acceptance angle in air for the fibre.

    A silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine

    Question

    (i) the critical angle at the core cladding interface,

    (ii) the numerical aperture for the fibre

    (iii) the acceptance angle in air for the fibre.

    Medium Open in App

    Updated on : 2022-09-05

    Here,μ

    Solution Verified by Toppr 1 ​ =1.50;μ 2 ​ =1.47; μ 0 ​ =1

    (i) Critical angle θ

    c ​

    at the core-cladding interface is given by

    θ c ​ =sin −1 1.50 1.47 ​ =78.5 0

    (ii) Numerical aperture,NA=(μ

    1 ​ 2 −μ 2 ​ 2 ) 2 1 ​ =[(1.50) 2 −(1.47) 2 ] 2 1 ​ =(2.25−2.16) 1/2 =0.30

    (iii) Acceptance angle θ

    a ​ =sin −1 (NA) =sin −1 (0.30)=17.4 0

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    Answer to A step-index fiber has specified parameters for refractive....

    Chapter CH2 Problem 2MCQ

    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

    A. 0.344 B. 0.156 C. 0.486 D. 0.244

    Step-by-step solution

    Step 1 of 3

    The propagation of high-frequency electromagnetic light waves from the sender to receiver in the optical fiber–transmitting medium is referred to as optical fiber communication.

    The main component in optical fiber communication is the optical fiber. Optical fibers are generally made up of plastic or glass materials that have the properties to support the action of total internal reflection within the medium for the proper propagation of electromagnetic waves.

    The refractive index is the ratio of speed of propagation of light waves in the medium of free space to the speed of propagation of light waves in a particular material.

    Chapter 2, Problem 2MCQ is solved.

    View a sample solution

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    Corresponding textbook

    Optical Fiber Communications | 1st Edition

    ISBN-13: 9781316610046 ISBN: 1316610047 Authors: T. L. Singal Rent | Buy

    This is an alternate ISBN. View the primary ISBN for: null null Edition Textbook Solutions

    Optical Fiber Communications

    (1st Edition)

    Solutions for Chapter 2

    Problem 2MCQ: 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

    isA. 0.344B. 0.156C. 0.486D. 0.244

    Solutions for problems in chapter 2

    स्रोत : www.chegg.com

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