# Computer/Computer Networks MCQs Set-3 Sample Test,Sample questions

## Question: ``` What is a fundamental necessity in the fabrication of fibers for light transmission? ```

1.Same refractive index for both core and cladding

2.Pump source

3.Material composition of fiber

4.Variation of refractive index inside the optical fiber

1.True

2.False

1.Circulator

2. Gyrator

3.Attenuator

4.Connector

1.0.61

2.0.12

3.0.32

4.0.48

1.19.32

2.18.84

3.16.28

4.17.12

1.True

2.False

1.2846

2.2592

3.2432

4.2136

1.11.1μm

2.13.2μm

3.7.6μm

4.10.1μm

1.True

2.False

1.1.326μm

2.0.124μm

3.1.214μm

4.0.123μm

## Question: ```Absorption losses due to atomic defects mainly include ___________ ```

2.Missing molecules, oxygen defects in glass

3.Impurities in fiber material

4.Interaction with other components of core

1.0.51 μm

2.0.58 μm

3.0.61 μm

4.0.49 μm

1.Yes

2.No

1.7.31μm

2.8.71μm

3.5.26μm

4.6.50μm

## Question: ```At what temperature range, does the melting of multi components glass systems takes place? ```

1.100-300 degree Celsius

2.600-800 degree Celsius

3.900-1300 degree Celsius

4.1500-1800 degree Celsius

1.True

2.False

1.True

2.False

1.1

2.2

3.3

4.4

1.One

2.Four

3.Two

4.Three

1.One

2.Three

3.Two

4.Four

1.One

2.Two

3.Three

4.Five

1.Two

2.One

3.Three

4.Four

## Question: ```How the potential macro bending losses can be reduced in case of multimode fiber? ```

1.By designing fibers with large relative refractive index differences

2.By maintaining direction of propagation

3.By reducing the bend

4.By operating at larger wavelengths

## Question: ```In the given equation, state what αr suggests? ```

2.Refractive index difference

4.Constant of proportionality

## Question: ```It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction. ```

1.Fiber slice

2.Optical fiber connector

3.Optical isolator

4.Optical coupler

1.True

2.False

## Question: ```Meridional rays in graded index fibers follow ____________ ```

1.Straight path along the axis

2.Curved path along the axis

3.Path where rays changes angles at core-cladding interface

4.Helical path

1.True

2.False

1.True

2.False

## Question: ```One of the given statements is true for intermodal dispersion. Choose the right one. ```

1.Low in single mode and considerable in multimode fiber

2.Low in both single mode and multimode fiber

3.High in both single mode and multimode fiber

4.High in single mode and low in multimode fiber

1.True

2.False

1.True

2.False

## Question: ```Population inversion is obtained at a p-n junction by __________ ```

1.Heavy doping of p-type material

2.Heavy doping of n-type material

3.Light doping of p-type material

4.Heavy doping of both p-type and n-type material

1.True

2.False

## Question: ```Skew rays follow a ___________ ```

1.Hyperbolic path along the axis

2.Parabolic path along the axis

3.Helical path

4.Path where rays changes angles at core-cladding interface

1.2 dB

2.0.7 dB

3.0.2 dB

4. 1 dB

## Question: ```The difference between the modes’ refractive indices is called as ___________ ```

1.Polarization

2.Cutoff

3.Fiber birefringence

4.Fiber splicing

## Question: ```The effects of intrinsic absorption can be minimized by ___________ ```

1.Ionization

3.Suitable choice of core and cladding components

4.Melting

## Question: ```The liquid-phase melting technique is used for the production of fibers ___________ ```

1.With a core diameter of 50μm

2.With a core diameter less than 100μm

3.With a core diameter more than 200μm

4.With a core diameter of 100μm

## Question: ```The minute perturbations and impurities in the fiber drawing process using preform technique can result in very high losses of _____________ ```

1.Between 500 and 1000 dB/km

2.Between 100 and 300 dB/km

3.Between 1200 and 1600 dB/km

4.More than 2000 dB/km

## Question: ```The ______________ system is best developed and is used for fabricating both lasers and LEDs for the shorter wavelength region. ```

1.InP

2.GaSb

3.GaAs/GaSb

4.GaAs/Alga AS DH

## Question: ```What is needed to predict the performance characteristics of single mode fibers? ```

1.The intermodal delay effect

2.Geometric distribution of light in a propagating mode

3.Fractional power flow in the cladding of fiber

4.Normalized frequency

## Question: ```What is the first stage in liquid-phase-technique? ```

1.Preparation of ultra-pure material powders

2.Melting of materials

3.Decomposition

4.Crystallization

## Question: ```What is the unit of normalized frequency? ```

1.Hertz

2.Meter/sec

3.Coulombs

4.It is a dimensionless quantity

## Question: ```Which equation is used to calculate MFD? ```

1.Maxwell’s equations

2.Peterman equations

3.Allen Cahn equations

4.Boltzmann’s equations

## Question: ```Which feature of an optical isolator makes it attractive to use with optical amplifier? ```

1.Low loss

2.Wavelength blocking

3.Low refractive index

4.Attenuation

## Question: ```Which materials are unsuitable for the fabrication of graded index fiber? ```

1.Glass-like-materials

2.Mono-crystalline structures

3.Amorphous material

4.Silica based material

## Question: ```Which of the following statements best explain the concept of material absorption? ```

1.A loss mechanism related to the material composition and fabrication of fiber

2.A transmission loss for optical fibers

3.Results in attenuation of transmitted light

4.Causes of transfer of optical power

## Question: ```Which processes are involved in the purification stage in liquid-phase-technique? ```

1.Filtration, Co-precipitation, Re-crystallization

2.Decomposition, Filtration, Drying

3.Doping, Drying, Decomposition

4.Filtration, Drying, Doping

## More MCQS

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