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ESE 2021 Technical Quiz || Digital communication: Power line carrier communication systems

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Question 1

Four signals g1(t), g2(t), g3(t) and g4(t) are to be multiplexed and transmitted. g1(t) and g4(t) have a bandwidth of 4 kHz, and the remaining two signals have bandwidth of 8 kHz. Each sample requires 8 bit for encoding. What is the minimum transmission bit rate of the system.

Question 2

A cellular system operator A is allocated a total spectrum of 5 MHz for deployment of on analog cellular system based on the FDMA technique, with each simplex channel occupying 25 kHz bandwidth. Assuming no guard band, the maximum number of simultaneous call possible in the system is …………

Question 3

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

Question 4

Which of the following statements regarding different binary encoding techniques is true?
(i) Error detection is possible in Alternative Mask Inversion code.
(ii) NRZ code provides better clock recovery than RZ code.
(iii) For transmitting long sequences of 1s, Manchester code is better than NRZ code.

Question 5

Twenty four voice signals are sampled uniformly at a rate of 8 KHz and then time division multiplexed. The sampling process uses flat top samples with 1 Hs. Duration. The multiplexing operation includes provision for synchronization by adding and extra pulse of 1 us duration. The spacing b/w successive pulses of the multiplexed signal is
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