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235.

Three analog signals, having bandwidths 1200 Hz, 600 Hz and 600 Hz, are sampled at their respective Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
[2 marks]
(a) 115.2 kbps
(b) 28.8 kbps
(c) 57.6 kbps
(d) 38.4 kbps

asked in Electronics and Communication Engineering, 2004

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236.

Group 1 Group 2

1. FM P. Slope overload

2. DM
Q. µ-law

3. PSK
R. Envelope detector

4. PCM S. Capture effect

T. Hilbert transform

U. Matched filter

[2 marks]
(a) 1 – T, 2 – P, 3 – U, 4 - S
(b) 1 – S, 2 – U, 3 – P, 4 - T
(c) 1 – S, 2 – P, 3 – U, 4 - Q
(d) 1 – U, 2 – R, 3 – S, 4 - Q

asked in Electronics and Communication Engineering, 2004

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237.

A random variable X with uniform density in the interval 0 to 1 is quantized as follows:
If 0 ≤ X ≤ 0.3, x_q = 0
If 0.3 < X ≤ 1, x_q= 0.7
Where x_q is the quantized value of X
The root-mean square value of the quantization noise is [2 marks]
(a) 0.573
(b) 0.198
(c) 2.205
(d) 0.266

asked in Electronics and Communication Engineering, 2004

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238.

Consider a binary digital communication system with equally likely 0’s and 1’s. When binary 0 is transmitted the voltage at the detector input can lie between the levels -0.25 V and + 0.25 V with equal probability: when binary 1 is transmitted, the voltage at the detector can have any value between 0 and 1V with equal probability. If the detector has a threshold of 2.0V (i.e., if the received signal is greater than 0.2V, the bit is taken as 1), the average bit error probability is [2 marks]
(A) 0.15
(B) 0.2
(C) 0.05
(D) 0.5

asked in Electronics and Communication Engineering, 2004

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239.

A 100 MHz carrier of 1 V amplitude and a 1 MHz modulating signal of 1 V amplitude are fed to a balanced modulator. The output of the modulator is passed through an ideal high-pass filter with cut-off frequency of 100 MHz. The output of the filter is added with 100 MHz signals of 1 V amplitude and 90° phase shift as shown in Fig. The envelope of the resultant signal is

[2 marks]
(a) constant
(b) (1 + sin(2π×10⁶t))^1/2
(b) (5/4 - sin(2π×10⁶t))^1/2
(b) (5/4 + sin(2π×10⁶t))^1/2

asked in Electronics and Communication Engineering, 2004

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240.

Two sinusoidal signals of same amplitude and frequencies 10 kHz and 10.1 kHz are added together. The combined signal is given to an ideal frequency detector. The output of the detector is [2 marks]
(a) 0.1 kHz sinusoid
(b) 20.1 kHz sinusoid
(c) a linear function of time
(d) a constant

asked in Electronics and Communication Engineering, 2004

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