Question 1

Stress corrosion must be considered while designing and testing optical fiber cables.

Accepted Answer

A) True 
 B)False

Question 2

Multimode step index fibers have a bandwidth of

Accepted Answer

A)  2 to 30 mhz km
B)  6 to 50 mhz km
C)  10 to 40 mhz km
D)  8 to 40 mhz km

Question 3

Multimode graded index fibers are manufactured from materials with

Accepted Answer

A)  lower purity
B)  higher purity than multimode step index fibers.
C)  no impurity
D)  impurity as same as multimode step index fibers.

Question 4

When optical fibers are to be installed in a working environment, the most important parameter to be considered is

Accepted Answer

A)  transmission property of the fiber
B)  mechanical property of the fiber
C)  core cladding ratio of the fiber
D)  numerical aperture of the fiber

Question 5

Optical fibers for communication use are mostly fabricated from

Accepted Answer

A)  plastic
B)  silica or multicomponent glass
C)  ceramics
D)  copper

Question 6

Fiber mostly suited in single-wavelength transmission in O-band is

Accepted Answer

A)  low-water-peak non dispersion-shifted fibers
B)  standard single mode fibers
C)  low minimized fibers
D)  non-zero-dispersion-shifted fibers B

Question 7

Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.52*1010Nm?1 and Young's modulus of 9 *109nm?1.

Accepted Answer

A)  3.1 %
B)  2.8 %
C)  4.5 %
D)  3.9 %

Question 8

Single mode fibers allow single mode propagation; the cladding diameter must be at least

Accepted Answer

A)  twice the core diameter
B)  thrice the core diameter
C)  five times the core diameter
D)  ten times the core diameter

Question 9

In single mode fibers, the most beneficial index profile is

Accepted Answer

A)  step index
B)  graded index
C)  step and graded index
D)  coaxial cable

Question 10

A multimode step index fiber has a large core diameter of range

Accepted Answer

A)  100 to 300 ?m
B)  100 to 300 nm
C)  200 to 500 ?m
D)  200 to 500 nm A

Question 11

Multimode step index fiber has

Accepted Answer

A)  large core diameter & large numerical aperture
B)  large core diameter and small numerical aperture
C)  small core diameter and large numerical aperture
D)  small core diameter & small numerical aperture A

Question 12

It is not important to cover these optical fibers required for transmission.

Accepted Answer

A) True 
 B)False

Question 13

What does n denotes in the equation given below, if vc is the crack velocity; A is the constant for the fiber material and KI is the strength intensity factor?

Accepted Answer

A)  refractive index
B)  stress corrosion susceptibility
C)  strain
D)  young's modulus

Question 14

The fibers mostly not used nowadays for optical fiber communication system are

Accepted Answer

A)  single mode fibers
B)  multimode step fibers
C)  coaxial cables
D)  multimode graded index fibers

Question 15

Optical fibers for communication use are mostly fabricated from

Accepted Answer

A)  plastic
B)  silica or multicomponent glass
C)  ceramics
D)  copper

Question 16

Multimode graded index fibers use incoherent source only.

Accepted Answer

A) True 
 B)False

Question 17

A fiber which is referred as non-dispersive shifted fiber is

Accepted Answer

A)  coaxial cables
B)  standard single mode fibers
C)  standard multimode fibers
D)  non zero dispersion shifted fibers

Question 18

Modified Chemical Vapor Deposition (MCVD) process is also called as an inside vapor phase oxidation (IVPD) technique.

Accepted Answer

A) True 
 B)False

Question 19

An Si-O bond with a Young's modulus of 9*1010Nm?1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.

Accepted Answer

A)  4.32*109nm?1
B)  6.32*109nm?1
C)  5.2*109nm?1
D)  3*109nm?1

Question 20

Multimode graded index fibers have overall buffer jackets same as multimode step index fibers but have core diameters

Accepted Answer

A)  larger than multimode step index fibers.
B)  smaller than multimode step index fibers.
C)  same as that of multimode step index fibers.
D)  smaller than single mode step index fibers.

Exam 7: Optical Fiber Communication and Fabrication

Stress corrosion must be considered while designing and testing optical fiber cables.

Correct AnswerverifiedShow Answer

Multimode step index fibers have a bandwidth of

Correct AnswerverifiedShow Answer

Multimode graded index fibers are manufactured from materials with

Correct AnswerverifiedShow Answer

When optical fibers are to be installed in a working environment, the most important parameter to be considered is

Correct AnswerverifiedShow Answer

Optical fibers for communication use are mostly fabricated from

Correct AnswerverifiedShow Answer

Fiber mostly suited in single-wavelength transmission in O-band is

Correct AnswerverifiedB

Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.52*1010Nm?1 and Young's modulus of 9 *109nm?1.

Correct AnswerverifiedShow Answer

Single mode fibers allow single mode propagation; the cladding diameter must be at least

Correct AnswerverifiedShow Answer

In single mode fibers, the most beneficial index profile is

Correct AnswerverifiedShow Answer

A multimode step index fiber has a large core diameter of range

Correct AnswerverifiedA

Multimode step index fiber has

Correct AnswerverifiedA

It is not important to cover these optical fibers required for transmission.

Correct AnswerverifiedShow Answer

What does n denotes in the equation given below, if vc is the crack velocity; A is the constant for the fiber material and KI is the strength intensity factor?

Correct AnswerverifiedShow Answer

The fibers mostly not used nowadays for optical fiber communication system are

Correct AnswerverifiedShow Answer

Optical fibers for communication use are mostly fabricated from

Correct AnswerverifiedShow Answer

Multimode graded index fibers use incoherent source only.

Correct AnswerverifiedShow Answer

A fiber which is referred as non-dispersive shifted fiber is

Correct AnswerverifiedShow Answer

Modified Chemical Vapor Deposition (MCVD) process is also called as an inside vapor phase oxidation (IVPD) technique.

Correct AnswerverifiedShow Answer

An Si-O bond with a Young's modulus of 9*1010Nm?1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.

Correct AnswerverifiedShow Answer

Multimode graded index fibers have overall buffer jackets same as multimode step index fibers but have core diameters

Correct AnswerverifiedShow Answer

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B

Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.5210¹⁰Nm^?1 and Young's modulus of 9 10⁹nm^?1.

Correct Answer
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A

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A

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An Si-O bond with a Young's modulus of 9*10¹⁰Nm^?1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.

Correct Answer
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Correct Answer
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