Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-2

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1. Find the 8-ary waveform for the word ‘HAPPY’.




2. Find the 32-ary waveform for the word ‘HAPPY’.




3. What are the characteristics of an ideal transmission line?




4. The point at which the output signal power has fallen to 0.707 of its peak value is called as _____




5. The ratio of the filter bandwidth at -60db and -6db amplitude response point is called as _____




6. As the order of the filter increases, the cost ______ and complexity ______




7. Which filter has maximum flatness?




8. The measure of the width of the main lobe is called as ________




9. SQNR can be improved by _______ sampling rate.




10. Which offers better SQNR?




11. Two functions are called as orthogonal if on integrating the product we get




12. Eigen functions are not orthogonal.




13. Shot noise is produced by




14. Shot noise is avoidable when current is




15. Which occurs due to equilibrium fluctuations?




16. Flicker noise is called as




17. Which has the same power spectral density?




18. Which noise is useful for dithering?




19. Capacity of a channel can be increased by




20. Capacity of the channel can be increased by reducing in band noise power.




21. Thermal noise is a wide sense stationary process.




22. The maximum likelihood function is




23. Matched filtering operation includes




24. Matched filter is




25. Which consists of less ISI?




26. Digital communication is _______ to environmental changes?




27. Advantages of digital communication are




28. What is necessary for digital communication?




29. What are the disadvantages of digital communication?




30. Examples of digital communication are




31. Which system uses digital transmission?




32. The interval of frequencies outside which the spectrum is zero is called as ________




33. The attenuation level in bounded power spectral density is




34. Synchronization available in digital communication are




35. Digital system includes




36. Analog to digital conversion includes




37. What are the main features of a receiver?




38. What conditions must be fulfilled in a good digital communication system?




39. Wired channels are




40. The equivalent temperature in a receiver design must be kept




41. Which corrects the sampling time problem in a digital system?




42. What are the main features of a transmitter?




43. Transmission media used in low frequency band are




44. Transmission media used for medium frequency band are




45. Matched filter technique is used to




46. Matched filter can also be used as least squares estimator.




47. Digital communication system can handle




48. The information source of a digital communication system can be




49. Which are the common transmission media used in digital communication system?




50. The basic transmission-reception system is a ______ system.