Analog and Digital Communication Systems | 60 Q&A | Modulation, Noise, Transmission, PCM | ECE Core | VTU

This document offers a focused set of 60 exam-oriented questions and answers for the subject Analog and Digital Communication Systems, relevant for the 2025/2026 academic year. It is ideal for understanding the foundational and applied aspects of communication engineering, including concepts such as types of communication (point-to-point, broadcast), channel bandwidths (copper, coaxial, microwave, optical fibre), modulation techniques (AM, FM, PM, ASK, FSK, PSK), signal classifications (periodic, random, aperiodic), and pulse modulation methods (PCM, DPCM, Delta, Adaptive DM). The document also explains various types of noise (internal and external), including thermal noise, shot noise, and transit-time noise, as well as standard frequency bands (ELF to EHF). Every question is paired with a clear and correct answer, making it an efficient revision tool or quick reference for students. This material is suitable for: – Electronics and Communication Engineering (ECE) undergraduates – Courses such as Analog and Digital Communication, Communication Systems, and Signals & Systems – Students from universities following the VTU curriculum – GATE/ESE/PSU aspirants seeking conceptual clarity in communication subjects Keywords: analog communication, digital communication, modulation techniques, amplitude modulation, frequency modulation, phase modulation, ASK, FSK, PSK, PCM, DPCM, delta modulation, adaptive modulation, noise types, thermal noise, shot noise, ELF, VHF, SHF, signal types, channel bandwidth, point-to-point, broadcast communication, ECE, communication systems, VTU