Communication Network Mock Test

1. A percentage of modulation greater than

2. How is the performance of SSB AM systems in fading channels?

3. FFSR in AM systems stands for

4. Which of the following stage is present in FM receiver but not in AM receiver?

5. Which of the following is a disadvantage of tone-in-band SSB system?

6. When noise is passed through a narrow band filter, the output of filter should be?

7. AM demodulation technique can be divided into and demodulation.

8. What do you understand by the term 'carrier' in modulation?

9. Which is the greatest disadvantage of Pulse Code Modulation?

10. In AM pilot carrier, transmission has

11. What is the use of Companding?

12. For a low level AM system, amplifier modulated stage must have

13. Which of the following is not an advantage of digital modulation?

14. In digital communication system, in order to increase noise immunity, it is necessary to increase

15. The performance of modulation scheme is not measured in terms of

16. In angle modulation, signal to noise ratio before detection is a function of

17. Which of the following is the ratio of the throughput data rate per Hertz?

18. is equal to width of main spectral lobe.

19. Which of the following are two methods for generating FM signal?

20. Which of the following is not necessarily an advantage of FM over AM?

21. The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A?

22. Which conveys more information?

23. The output of an information source is

24. In a delta modulation system, granular noise occurs when the

25. Coherent demodulation of FSK signal can be performed using

26. When pulse code modulation is applied to non binary symbols we obtain waveform called as

27. In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?

28. Which method is preferred in magnetic tape recording?

29. The signals which are obtained by encoding each quantized signal into a digital word is called as

30. In PCM encoding, quantization level varies as a function of

31. Sample resolution for LPCM bits per sample.

32. The return to zero waveform consists of

33. is often called the formant of the speech signal.

34. The real part of an antenna's input impedance is due to

35. QPSK provides twice the bandwidth efficiency and energy efficiency as compared to BPSK.

36. ASCII code is a

37. Coherent PSK and non coherent orthogonal FSK have a difference of in PB.

38. Self information should be

39. The self information of random variable is

40. A rate distortion function is a

41. Which of the following is not a detection technique used for detection of ?/4 QPSK signals?

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