An alternative modification of the dispersion characteristics of single mode fibers involves achievement of low dispersion gap over the low-loss wavelength region between __________

An alternative modification of the dispersion characteristics of single mode fibers involves achievement of low dispersion gap over the low-loss wavelength region between . . . . . . . .

A

0.2 and 0.9μm

B

0.1 and 0.2μm

C

1.3 and 1.6μm

D

2 and 3μm

A single mode fiber has a zero dispersion wavelength of 1.21μm and a dispersion slope of 0.08 psnm-2km-1. What is the total first order dispersion at wavelength 1.26μm.

A

-2.8psnm-1 km-1

B

-3.76psnm-1 km-1

C

-1.2psnm-1 km-1

D

2.4psnm-1 km-1

A single mode fiber has a zero dispersion wavelength of 1.21μm and a dispersion slope of 0.08 psnm^-2km^-1. What is the total first order dispersion at wavelength 1.26μm.

A

-2.8psnm^-1 km^-1

B

-3.76psnm^-1 km^-1

C

-1.2psnm^-1 km^-1

D

2.4psnm^-1 km^-1

A polymer matrix composite is reinforced with long continuous ceramic fibers aligned in one direction. The young's moduli of the matrix and fibers are Em and Er respectively and the volume fraction of the fibers is f. Assuming iso-stress condition, Young's modulus of the composite Ec in a direction perpendicular to the length of fibers, is given by the expression

A

Ec = (1 - f) E_m + f E_f

B

Ec = f Em + (1 - f) Er

C

$$\frac{1}{{Ec}} = \frac{{\left( {1 - f} \right)}}{{{E_m}}} + \frac{f}{{Ef}}$$

D

$$\frac{1}{{Ec}} = \frac{f}{{{E_m}}} + \frac{{\left( {1 - f} \right)}}{{Ef}}$$

There are two sets given below in which Set I offers types of learner's characteristics and Set II gives their description. Match the two sets: Set I (Learner’s Characteristics) Set II (Description) a. Academic Characteristics i. Learner encodes and decodes relevant messages correctly b. Social Characteristics ii. Learner selects different themes in his/her course when needed c. Emotional Characteristics iii. Learner works as a team member of the peers d. Cognitive Characteristics iv. Learner starts respecting the individual differences evident in likes and dislikes of members of his class Choose the correct answer from the following options:

A

a - ii, b - iv, c - i, d - iii

B

a - i, b - ii, c - iii, d - iv

C

a - ii, b - iii, c - iv, d - i

D

a - iii, b - i, c - ii, d - iv

Simplify : $${{{5 \over 3} \times {7 \over {51}}{\text{ of }}{{17} \over 5} - {1 \over 3}} \over {{2 \over 9} \times {5 \over 7}{\text{ of }}{{28} \over 5} - {2 \over 3}}}$$

A

$$\frac{1}{2}$$

B

4

C

2

D

$$\frac{1}{4}$$

A gap opening penalty for any gap (g) and a gap extension penalty for each element in the gap (r) are most often used, to give a total gap score wx, according to the equation ______

A

wx – rx = -g

B

wx = g – rx

C

wx = g + rx

D

wx + g + rx = 0

In a single-mode optical fiber, the zero-dispersion wavelength refers to the wavelength at which the

A

material dispersion is zero

B

waveguide dispersion is zero

C

sum of material dispersion and wave guide dispersion is zero

D

material dispersion and waveguide dispersion are simultaneously zero

One major difference between the action potential of cardiac muscle fibers and the action potential of skeletal muscle fibers is that in cardiac muscle fibers

A

the membrane is permeable to Na+, not K+

B

voltage-gated K+ channels open during depolarization, not repolarization

C

depolarization is prolonged compared to that in skeletal muscle fibers

D

the refractory period is shorter than that of skeletal muscle fibers

Dispersion-shifted single mode fibers are created by __________

A

Increasing fiber core diameter and decreasing fractional index difference

B

Decreasing fiber core diameter and decreasing fractional index difference

C

Decreasing fiber core diameter and increasing fractional index difference

D

Increasing fiber core diameter and increasing fractional index difference

An alternative modification of the dispersion characteristics of single mode fibers involves achievement of low dispersion gap over the low-loss wavelength region between __________

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