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Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-15

Choose a topic to test your knowledge and improve your Electrical measurements skills

1. Which should be used first to decrypt?




2. The digital signature provides authentication to the




3. In hash function output length is fixed.




4. The hash function




5. DSA protocol is based on




6. What is the source for performance degradation?




7. The received power is attenuated by a factor called




8. Scintillation describes the fading caused by




9. Large scale fading refers the attenuation in




10. Small scale refers to changes in




11. Small scale fading manifests due to




12. The parameters used to describe large scale fading are




13. Small scale fading occurs due to




14. What are the types of small scale fading that occurs due to Doppler shift?




15. Multiple isolated peaks in multipath components is called as




16. If delay time is greater than symbol time, _______ fading occurs.




17. If delay time is lesser than symbol time, ______ fading occurs.




18. When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.




19. Channel’s time spreading properties are




20. When channel coherence time is less than the time duration of a transmission symbol, then ______ fading occurs.




21. Minimum time required for magnitude change or phase change is called as




22. When a user’s moving, the user’s velocity causes shift in frequency. This is called as




23. Coherence time is _______ to Doppler spread.




24. Block fading occurs in




25. If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.




26. Flat fading can be avoided or stopped by




27. The effect of Doppler shift can be counterattacked by




28. When transmitter and receiver moves towards each other, the magnitude of frequency shift is




29. If signalling rate is less than fading rate, _____ fading occurs.




30. Frequency tracking loop can minimize irreducible error rate by using




31. The technique for combining diversity signals are




32. Diversity technique is used for combating




33. Diversity technique is applied at




34. Which is more effective and commonly preferred technique?




35. What are the modes of adaptive equalizer?




36. Which signalling scheme is preferred for fading channel?




37. Uncorrelated fading occurs when




38. Interleaving does




39. Rake receiver does




40. Information reliability depends on




41. A rake receiver uses multiple




42. Rake receivers are used in




43. The rake receivers functions are similar to




44. Fading channel has memory.




45. How can frequency selective distortion be minimized?




46. How can slow fading be minimized?




47. Fast fading can be minimized by




48. The decision feedback equalizer has a linear traversal filter which is




49. The ISI and adjacent channel interference is removed by




50. The inter-leaver is more effective if the vehicle is