This document contains questions for an electronics and communication engineering exam on digital communication. It has two parts - Part A contains 10 multiple choice questions testing fundamentals of digital communication topics like time limited/unlimited signals, sampling theorem, quantization error, hamming distance, line codes, matched filters, eye patterns, and non-coherent detection. Part B contains 5 long answer questions testing topics like PWM/PPM generation, channel classification/models, quantization processes, convolutional/block coding, signal design for ISI elimination, error probability analysis of modulation schemes like ASK, PSK, FSK and receivers.