Important Questions on DIGITAL & ANALOG COMMUNICATION

Q1. Effect of Limited Bandwidth on Digital Signal. Explain.

Q2. Define and explain Shannon limit theorem.

Q3. Discuss different communication modes. Differentiate between asynchronous and synchronous transmission.

Q4. Difference between Secret key cryptography and public Key cryptography.

Q5. Explain with diagram different components of a communication system.

Q6. Explain properties of Fourier transform.

Q7. If f(t)-F(w) is Fourier transform pair. Find the Fourier transform of the following:

(i) f(t) coswot (ii) f2(t) (iii) F(-2t)

Q8. Explain the two physical layer interfaces i.e., RS232 and X.21

Q9. The bit sequence 1011101011 is to be transmitted using formats:

i) Unipolar RZ & NRZ

ii) Bipolar RZ & NRZ

Q10. Explain different transmission media:

(i) Fiber Optics (ii) Twisted pair (iii) Coaxial Pair

Q11. Explain following terms:

(i) Nyquist rate (ii)Shannon Limit

 

Q12. Differentiate between TDM and WDM.

Q13. Explain ISDN with applications, advantages & Disadvantages.

Q14. Differentiate between circuit switching and packet switching systems.

Q15. Explain the sliding window protocol in detail.

Q16. Explain the following:

(i) Data compression (ii) Run Length encoding

Q17. Draw and explain the basic block diagram of communication system.

Q18. What are the properties of signal? Compare analog signal and digital signal.

Q19. What are ESD and PSD? Derive expression for both.

Q20. Explain error detection and parity check.

Q21. Define Modulation: Amplitude, Phase and frequency.

Q22. Differentiate between connection oriented and connectionless service.

Q23. What are transmission impairments?

Q24. Explain Huffman encoding with the help of example.

Q25. Describe PSTN.