Electronics and Communication Engineering - Exam Questions Papers

16. 

What can be the maximum dimension of an array in C language program?

A. 3
B. 4
C. 5
D. It is compiler dependent

Answer: Option D

Explanation:

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17. 

Choose the correct statement

A. The reflection coefficient (r) of a transmission line is greater than 1
B. r varies from 0 to ∞
C. r is less than or equal to 1
D. r varies from - ∞ to + ∞

Answer: Option C

Explanation:

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18. 

Which of the following modes can exist in a rectangular waveguide?

A. TM10
B. TE10
C. TM00
D. TM01

Answer: Option B

Explanation:

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19. 

For plane wave propagating in free space or two conductor transmission line, what must be the relationship between the phase velocity vp , the group velocity vg and speed of light c?

A. vp > c > vg
B. vp < c < vg
C. vp = c = vg
D. vp < vg < c

Answer: Option C

Explanation:

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20. 

The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T = 300 K, electronic charge = 1.6 x 10-19C, thermal voltage = 26mV and electron mobility = 1350 cm2/V-s

The magnitude of the electric field at x = 0.5 μm is

A. 1 kV/cm
B. 5 kV/cm
C. 10 kV/cm
D. 26 kV/cm

Answer: Option C

Explanation:

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