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487.

A load of 50Ω is connected in shunt in a 2-wire transmission line of Z₀ =50Ω as shown in the figure. The 2-port scattering parameter matrix (S-matrix) of the shunt element is

[2 marks]

asked in Electronics and Communication Engineering, 2007

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488.

The E field in a rectangular waveguide of inner dimensions a × b is given by

where H₀ is a constant, and a and b are the dimensions along the x-axis and the y-axis respectively. The mode of propagation in the waveguide is
[2 marks]
(A) TE₂₀
(B) TM₁₁
(C) TM₂₀
(D) TE₁₀

asked in Electronics and Communication Engineering, 2007

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489.

The H field (in A/m) of a plane wave propagating in free space is given by

The time average power flow density in watts is [2 marks]
(A) η_o/100
(B) 100/η_o
(C) 50(η_o)²
(D) 50/η_o

asked in Electronics and Communication Engineering, 2007

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490.

An air-filled rectangular waveguide has inner dimensions of 3 cm × 2 cm. The wave impedance of the TE₂₀ mode of propagation in the waveguide at a frequency of 30 GHz is (free space impedance η_o = 377Ω) [2 marks]
(A) 308 Ω
(B) 355 Ω
(C) 400 Ω
(D) 461 Ω

asked in Electronics and Communication Engineering, 2007

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491.

In a Direct Sequence CDMA system the chip rate is 1.2288 ×10⁶ chips per second. If the processing gain is desired to be AT LEAST 100, the data rate
[2 marks]
(A) Must be less than or equal to 12.288 ×10³ bits per sec
(B) Must be greater than 12.288 ×10³ bits per sec
(C) Must be exactly equal to 12.288 ×10³ bits per sec
(D) Can take any value less than 122.88 ×10³ bits per sec.

asked in Electronics and Communication Engineering, 2007

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492.

In a GSM system, 8 channels can co-exist in 200 KHz bandwidth using TDMA. A GSM based cellular operator is allocated 5 MHz bandwidth. Assuming a frequency reuse factor of 1/5, i.e. a five-cell repeat pattern, the maximum number of simultaneous channels that can exist in one cell is:
[2 marks]
(A) 200
(B) 40
(C) 25
(D) 5

asked in Electronics and Communication Engineering, 2007

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