Title mcq Digital Communication System.pdf ✅

Way to Polytechnic ● Way to Polytechnic DIGITAL COMMUNICATION SYSTEMS Unit 1 **Unit 1: Digital Communication Systems** 1.1 Block diagram and Sub-system Description: 1. What does a block diagram illustrate in a digital communication system? A) Mathematical equations B) Functional components and their connections C) Hardware implementation details D) Software algorithms Answer: B) Functional components and their connections 2. Which term describes the subsystems' explanation within a digital communication system? A) Signal flow B) Block diagram C) Modulation scheme D) Noise analysis Answer: A) Signal flow 1.2 Sampling and Quantization: 3. What does PAM stand for in digital communication? A) Pulse Amplitude Modulation B) Phase Amplitude Modulation C) Pulse Analog Modulation D) Phase Analog Modulation Answer: A) Pulse Amplitude Modulation 4. What is the primary purpose of PCM (Pulse Code Modulation)? A) To reduce bandwidth B) To improve signal-to-noise ratio https://sbte.way2poly.in
Way to Polytechnic ● Way to Polytechnic C) To digitize analog signals D) To increase transmission speed Answer: C) To digitize analog signals 1.3 Line Codes and Bandwidth: 5. What do line codes primarily determine in digital communication? A) Error correction B) Bandwidth efficiency C) Power consumption D) Data encryption Answer: B) Bandwidth efficiency 6. Which term describes the method of combining multiple PCM channels for transmission? A) Time-Division Multiplexing (TDM) B) Frequency Division Multiplexing (FDM) C) Pulse Code Modulation (PCM) D) Phase-Shift Keying (PSK) Answer: A) Time-Division Multiplexing (TDM) 1.4 Frame Structures and Synchronization: 7. What is the purpose of frame synchronization in digital communication? A) To encode data B) To align received bits into frames C) To increase transmission speed D) To reduce signal distortion Answer: B) To align received bits into frames 8. What technique is used to prevent bit-level synchronization issues in digital communication? A) Frame stuffing B) Bit stuffing C) Frame alignment https://sbte.way2poly.in
Way to Polytechnic ● Way to Polytechnic D) Bit alignment Answer: B) Bit stuffing 9. What is the term used for the hierarchical arrangement of PCM systems? A) PCMTDM B) PCM Sync C) PCM Hierarchy D) TDM Frame Answer: A) PCMTDM 10. What does PCMTDM stand for in digital communication systems? A) Pulse Code Modulation Time-Division Multiplexing B) Phase Coded Modulation Time-Division Multiplexing C) Pulse Code Modulation Transmission Density Modulation D) Pulse Coded Modulation Transmission Division Modulation Answer: A) Pulse Code Modulation Time-Division Multiplexing Unit 2 Quantization noise analysis of DM and ADM **2.1 Quantization Noise Analysis:** 1. Which term describes the analysis of quantization noise in Delta Modulation (DM) and Adaptive Delta Modulation (ADM)? A) Modulation analysis B) Noise distortion analysis C) Quantization noise analysis D) Signal-to-noise ratio analysis Answer: C) Quantization noise analysis 2. What is the primary advantage of Adaptive Delta Modulation (ADM) over traditional Delta Modulation (DM)? https://sbte.way2poly.in
Way to Polytechnic ● Way to Polytechnic A) Lower quantization noise B) Higher transmission speed C) Better error correction capability D) Reduced complexity Answer: A) Lower quantization noise **2.2 DPCM and ADPCM:** 3. What does DPCM stand for in digital communication systems? A) Digital Phase Code Modulation B) Differential Pulse Code Modulation C) Dynamic Pulse Coded Modulation D) Discrete Probability Coded Modulation Answer: B) Differential Pulse Code Modulation 4. What is the primary benefit of Adaptive Differential Pulse Code Modulation (ADPCM) over conventional DPCM? A) Lower bandwidth requirement B) Improved signal-to-noise ratio C) Reduced complexity D) Higher data transmission rate Answer: C) Reduced complexity **2.3 Baseband Transmission and Matched Filtering:** 5. In baseband transmission, what is the purpose of a matched filter? A) To eliminate noise B) To amplify the signal C) To minimize intersymbol interference D) To synchronize clocks Answer: C) To minimize intersymbol interference 6. In the presence of additive Gaussian noise, what is the expected performance of baseband transmission with matched filtering? A) Increased error rate https://sbte.way2poly.in