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Electronics and Communication Digital Communication Difficulty: Medium

What is the required bandwidth of a PCM system for 256 quantization levels when 48 telephone channels, each band limited to 4 kHz, are to be time-division multiplexed by this PCM?

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Consider the following statements with regard to FCC structure: 1. Number of nearest neighbour atoms is twelve. 2. Packing efficiency is 0.74. 3. There is an atom at the body centre of the unit cell. Which of the statements given above is/are correct? For the system $$\frac{2}{{s + 1}},$$ the approximate time taken for a step response to reach 98% of its final value is gm is . . . . . . . . to Ic. The diffusion capacitance of a p-n junction diode Which of the following materials is preferred for transmitting electrical energy over long distance?