JNTU
JNTU B.Tech III PRINCIPLES OF COMMUNICATIONS Previous Question Paper (November/December - 2018 - R13)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
What are discrete and digital signals.
Answer
A discrete signal is defined only at specific, distinct time intervals. A digital signal is a discrete-time signal that is also quantized, meaning it takes on a finite set of amplitude values represented by binary digits.
Discuss basic types of communication systems.
Answer
Communication systems are broadly categorized into:
- Analog Communication Systems: Transmit continuous-time signals where information is represented by continuous variations in amplitude, frequency, or phase.
- Digital Communication Systems: Transmit information as discrete symbols or pulses, typically binary, which are more robust to noise and interference.
Define the term modulation.
Answer
Sign in to view the complete answer paper.
Explain the difference between baseband and band pass transmission.
Answer
Sign in to view the complete answer paper.
Define Sampling and explain its significance.
Answer
Sign in to view the complete answer paper.
What is aliasing effect?
Answer
Sign in to view the complete answer paper.
What are the advantages of digital communication over analog?
Answer
Sign in to view the complete answer paper.
What is companding?
Answer
Sign in to view the complete answer paper.
What is uncertainty?
Answer
Sign in to view the complete answer paper.
State the properties of entropy.
Answer
Sign in to view the complete answer paper.
Part B
With a neat block diagram explain the basic blocks of communication system.
Answer
Sign in to view the complete answer paper.
Discuss the procedure of calculating noise power at the output of linear system with single noise source.
Answer
Sign in to view the complete answer paper.
A parallel tuned circuit is resonated at 200 MHz with a Q of 10, and a capacitance of 15 pF. The temperature of the circuit is 170 C. What noise voltage will be observed across the circuit by a wide band voltmeter?
Answer
Sign in to view the complete answer paper.
With the help of diagram, Explain DSB-C modulator.
Answer
Sign in to view the complete answer paper.
Explain the operation of envelope detector.
Answer
Sign in to view the complete answer paper.
Discuss in brief about NBFM.
Answer
Sign in to view the complete answer paper.
Give the comparison between FM and PM.
Answer
Sign in to view the complete answer paper.
Discuss the advantages and disadvantages of analog pulse modulation as compared to continuous-wave modulation.
Answer
Sign in to view the complete answer paper.
Explain how a PAM signal may be generated. How can it be demodulated?
Answer
Sign in to view the complete answer paper.
Comparer FDM with TDM.
Answer
Sign in to view the complete answer paper.
With necessary diagram explain the operation of TDM.
Answer
Sign in to view the complete answer paper.
Explain with necessary diagrams the operation of Delta Modulation system.
Answer
Sign in to view the complete answer paper.
What is Quantization Error and how it can be reduced.
Answer
Sign in to view the complete answer paper.
Represent the following bit stream with BPSK and BASK i) 10110101 ii) 01001000
Answer
Sign in to view the complete answer paper.
Explain the incoherent reception of BPSK signals.
Answer
Sign in to view the complete answer paper.
Explain the step by step approach of Shannon-Fano Coding Scheme.
Answer
Sign in to view the complete answer paper.
State and explain various properties of information.
Answer
Sign in to view the complete answer paper.
Define the following terms:
Code word
Answer
Sign in to view the complete answer paper.
Block length
Answer
Sign in to view the complete answer paper.
Code rate
Answer
Sign in to view the complete answer paper.
Channel data rate
Answer
Sign in to view the complete answer paper.
Hamming distance
Answer
Sign in to view the complete answer paper.