Dispersion-shifted single mode fibers are created by __________

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

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

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

A

Twice the core diameter

B

Thrice the core diameter

C

Five times the core diameter

D

Ten times the core diameter

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

India has been constantly negotiating for an expansion in the trade in services via Mode 4 as defined under the General Agreement on Trade in Services (GATS). Consider the following pairings regarding different modes of Services under GATS of the WTO: 1. Mode 1 : Cross-Border Supply of Services 2. Mode 2 : Temporary cross-border movement of a natural person to consume services abroad 3. Mode 3 : Cross-border provision of services via the commercial presence of a company in another country 4. Mode 4 : Temporary cross-border movement of service providers Which of the above are correctly paired?

A

Only 1 and 4

B

Only 2 and 3

C

Only 1, 3 and 4

D

All of the above

Post office protocol (POP) is a message access protocol which is used to extract message for client. In this regard, which of the following are true ? (A) POP has two modes, Delete mode and keep (B) In Delete mode, mail is deleted from mail box after each retrival (C) In Delete mode, mail is deleted from mail box before each retrieval (D) In keep mode, mail is deleted before retrival (E) In keep mode, mail remains in mail box after retrival Choose the correct answer from the options given below:

A

(A) and (B) only

B

(A), (D) and (E) only

C

(A), (B), (C) and (D) only

D

(A), (B) and (E) only

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

Which one of the following is the major difference between single mode and multi mode fibers?

A

Core material

B

Cladding material

C

Core diameter

D

Cladding diameter

A lamina (also called a ply or layer) is a single ﬂat layer of unidirectional ﬁbers or woven ﬁbers arranged in a matrix.

A

True

B

False

Let x be the mode of the data 23, 26, 22, 20, 24, 20, 26, 24, 26, 23, 20, 24, 28, 22, 26. If 22 is replaced by 24, then the mode of the data is y. What approx % of the new mode is the old mode?

A

107%

B

108%

C

109%

D

200%

Consider the statements given below- A: Relationship between Mean, Median and Mode is : Mode = 3 Median – 2 Mean B: It is also possible that there can be more than one mode or no mode for a data set. C: In a data set, half of the data points are smaller than the median and half of the data points are larger. Which of the above statement(s) is/are TRUE?

A

All A, B and C

B

Only A and B

C

Only A and C

D

Only B and C

Dispersion-shifted single mode fibers are created by __________

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