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Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-10

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1. Turbo code is a




2. The minimum nyquist bandwidth needed for baseband transmission of Rs symbols per second is




3. The capacity relationship is given by




4. Which parameter is called as Shannon limit?




5. Entropy is the measure of




6. Equivocation is the




7. For a error free channel, conditional probability should be




8. Average effective information is obtained by




9. Turbo codes are




10. Components used for generation of turbo codes are




11. Decoders are connected in series.




12. The inter leaver connected between the two decoders is used to




13. In soft decision approach what does -127 mean?




14. In soft decision approach 100 means?




15. In soft decision approach 0 represents




16. QPSK is a composite of




17. The IF transmission bandwidth of MFSK is




18. The bandwidth efficiency of MFSK is




19. The bandwidth efficiency increases as M increases.




20. The bandwidth efficiency of QFSK is _______ that of BFSK.




21. Which modulation is the most efficient one?




22. The primary communication resource is




23. Greater the redundancy lesser is the bandwidth expansion.




24. Which modulation scheme uses nonlinear transponders?




25. Which modulation requires more bandwidth?




26. Which modulation has lower side lobe levels?




27. Which modulation is spectrally more efficient?




28. Which modulation spectrum has narrow main lobe?




29. Which technique can be used for bandwidth reduction?




30. QPSK amplitude modulates




31. QAM is a combination of




32. Which refers to the presence of error correction coding scheme?




33. The system will be more bandwidth efficient as WTb decreases.




34. In MPSK, R/W




35. In MFSK, R/W




36. Which modulation is selected for power limited system?




37. The transmission rate is given as




38. Code’s redundancy is given as




39. For more than two quantization level, _______ is used.




40. How can the throughput of the system be increased?




41. In which technique spot beam antennas are used to point the radio signals in different directions?




42. In polarization division technique ______ polarization is used.




43. Channelization characterized by orthogonal spectra is called as




44. In double side band spectrum which side-band is called as inverted side-band?




45. The mixing and filtering of DSB removes




46. The super group is made up of




47. The orbital period of communication satellites is _______ as that of earth’s rotational period.




48. Adding improvement to the signal subset choice by starting with the densest possible lattice for the space is called as




49. Choosing a closely packed signal subset from any regular lattice or array of candidate points is called as




50. Trellis coded modulation uses