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793.

Consider a closed surface S surrounding a volume V. IF r is the position vector of a point inside S, with the unit normal of S, the value of the integral
[1 mark]
(A) 3V
(B) 5V
(C) 10V
(D) 15V

asked in Electronics and Communication Engineering, 2011

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794.

The solution of the differential equation dy/dx = ky, y(0) =c is : [1 mark]
(A) x= ce^-ky
(B) x= ke^cy
(C) y = ce^kx
(D) y = ce^-kx

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2011

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795.

The modes in a rectangular waveguide are denoted by TE_mn/TM_mn where m and n are the Eigen numbers along the larger and smaller dimensions of the waveguide respectively. Which one of the following statements is TRUE? [1 mark]
(A) The TM₁₀ mode of the waveguide does not exist
(B) The TE₁₀ mode of the waveguide does not exist
(C) The TM₁₀ and theTE₁₀modes both exist and have the same cut – off frequencies.
(D) The TM₁₀ and the TM₀₁ modes both exist and have the same cut – off frequencies.

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2011

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796.

The Column – 1 lists the attributes and the Column – 2 lists the modulation systems. Match the attribute to the modulation system that best meets it.

Column – 1 Column – 2

P. Power efficient transmission of signals I. Conventional AM

Q. Most bandwidth efficient transmission of voice signals II. FM

R. Simplest receiver structure III. VSB

S. Bandwidth efficient transmission of signals with significant dc component IV. SSB - SC

[1 mark]
(A) P – IV, Q – II, R – I, S – III
(B) P – II, Q – IV, R – I, S – III
(C) P – III, Q – II, R – I, S – IV
(D) P – II, Q – IV, R – III, S – I

asked in Electronics and Communication Engineering, 2011

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