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Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-11

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1. In finite state machines, output is predicted using




2. In TCM the signals are decoded using




3. Trellis coded modulation scheme




4. In TCM channel capacity can be increased.




5. Transmission bandwidth depends on




6. Which determines the error performance in TCM?




7. The TCM decoder uses




8. Flat top sampling of low pass signals




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




10. A PAM signal can be detected using




11. Coherent demodulation of FSK signal can be performed using




12. The use of non uniform quantization leads to




13. Which of the following requires a synchronizing signal?




14. A PWM signal can be generated by




15. TDM is less immune to cross-talk in channel than FDM.




16. In an ideal TDM system, the cross correlation between two users of the system is




17. TDM requires




18. In M-ary FSK, as M increases error




19. In M-ary FSK as M tends to infinity, probability of error tends to




20. For non coherent reception of PSK _____ is used.




21. Which modulation technique have the same bit and symbol error probability?




22. An amplifier uses ______ to take input signal.




23. Which has 50% maximum power efficiency?




24. Which generates high distortion?




25. Class B linear amplifiers have maximum power efficiency of




26. Which has the maximum power efficiency?




27. Free space in idealization which consists




28. Properties used to determine stream’s fidelity




29. In bipolar codes, pulses can be




30. Delta modulation is ______ conversion.




31. To achieve high signal to noise ratio, delta modulation must use




32. The demodulator in delta modulation technique is




33. Source of noise in delta modulation is




34. When probability of receiving a symbol is 1 then how much information will be obtained?




35. In channel encoding procedure




36. Modulation process includes




37. Switching exists in




38. Space division has dedicated




39. In time division system, the actual switch is called as




40. In time division, connection is established using




41. Analogue switches provides




42. Operations performed by switching system




43. PCM includes the process of




44. For which quantization process is used?




45. Modulation process corresponds to ______ the amplitude, frequency or phase.




46. Which has same probability of error?




47. Which has higher error probability performance?




48. Time division multiplexing uses




49. In TDM, at the receiver end, ____ filter is used.




50. Which provides more secure communication?