B.TECH - Semester 6 data communication Question Paper 2020 (sep)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- (b) Explain following wireless propagation modes
- Define half duplex and full duplex transmission mode.
- What are the factors which determine the performance of data communication?
- Write transmission characteristics of Optical Fibre Cable.
- Differentiate synchronous and asynchronous transmission.
- State and explain sampling theorem.
- Write the differences between AM and FM.
- Explain NRZ encoding scheme.
- What is forward error correction?
- Write working principle of circuit switching method.
- What are the advantages of WiFi technology? Answer any one full question from each module.
- (a) Explain time domain and frequency domain concept of a signal in a communication system. ..... 10
- (b) Explain following transmission impairments
- (i) Attenuation (ii) Delay distortion (iii) Noise. ..... 10 OR
- (a) Define Channel Capacity. Explain Shannon's channel capacity formula. Signal to Noise Ratio is often given in decibels. Assume $\mathrm{SNR}_{\mathrm{db}}=25$ and the channel bandwidth is 4 Mhz . Calculate theoretical channel capacity? ..... 10
- (i) Ground wave propagation (ii) Sky wave propagation. ..... 10 Module - II
- (a) Explain following digital modulation techniques
- (i) ASK (ii) FSK (iii) PSK. ..... 10
- (b) Explain the working principle of Pulse Code Modulation (PCM). ..... 10 OR
- (a) Explain following multiplexing technologies
- (i) FDM (ii) TDM . ..... 10
- (b) Discuss Delta modulation technique. ..... 10
- (a) Why would expect a CRC to detect more errors than a parity bit? $\mathbf{1 0}$ For $\mathrm{P}=1001$ and $\mathrm{M}=11010011$ Find CRC .
- (b) Explain the concepts of Hamming codes and convolution codes. 10 OR
- (a) Explain the datagram approach and virtual circuit approach for packet switching network.
- (b) Write short notes on following wireless communication technique.
- (i) GSM (ii) GPRS.