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

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 + ∞

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

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

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