Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-7

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1. M-ary signalling produces _______ error performance with orthogonal signalling and _______ error performance with multiple phase signalling.




2. Which is more vulnerable to noise?




3. In which system, bit stream is portioned into even and odd stream?




4. The error performance of MPSK ______ as M or k increases.




5. In MPSK adding new signals _______ make it vulnerable to noise and in MFSK _______ make it vulnerable.




6. In orthogonal signalling with symbols containing more number of bits we need ____ power.




7. For FSK signalling, WT is equal to




8. Energy per symbol Es is given as




9. The relation between the probability of bit error and probability of symbol error in M-ary orthogonal signalling is




10. As limit of k increases, the ratio of PB/PE becomes




11. Link budget consists of calculation of




12. Link budget can help in predicting




13. Which is the primary cost for degradation of error performance?




14. Which factor adds phase noise to the signal?




15. Antennas are used




16. Mechanism contributing to a reduction in efficiency is called as




17. Space loss occurs due to a decrease in




18. Antenna’s efficiency is given by the ratio of




19. Effective radiated power of an isotropic radiator can be given as a product of




20. According to reciprocity theorem, _____ and _____ are identical.




21. Field of view is ______ to antenna gain.




22. Antenna gain ______ as effective area increases.




23. The beam-width becomes narrower on




24. Path loss Ls is dependent on




25. Thermal noise is generated due to




26. In analog receivers, noise bandwidth is _________ signal bandwidth.




27. The link availability measures the percentage of time the link can be ______




28. Visibility is ________ to required availability.




29. The stop and wait ARQ needs _______ connection.




30. In continuous ARQ will pullback uses _____ system.




31. Which method requires less redundancy?




32. Hybrid automatic repeat request is a combination of




33. Automatic repeat request is also called as




34. Error detection is realized using




35. Check-sum scheme has




36. Example of block code is




37. Noise figure measures the




38. Noise figure is a parameter that represents a ______ of the system.




39. When two networks are connected in series, its composite noise figure can be given as




40. The space window region ranges from




41. Atmospheric window region is used for




42. Which parameter is referred to as receiver sensitivity?




43. What are the functions of satellite repeaters?




44. What are the functions of non-regenerative repeaters?




45. In which repeaters uplink is decoupled from the downlink?




46. AM-to-AM conversion brings about




47. AM-to-PM conversion brings about




48. Channel coding relates to area such as




49. Examples of structured sequences are




50. Antipodal signals are