Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-5

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1. Some of the M-ary waveforms are




2. Which method should be implemented for reducing bandwidth?




3. In M-ary PPM waveform, modulation is effected by




4. For both PPM and PDM _______ is kept constant.




5. The method in which small amount of controlled ISI is introduced into the data stream rather than trying to eliminate it completely is called as




6. From digital filter we will get the output pulse as the _______ of the current and the previous pulse.




7. In duobinary signalling method, for M-ary transmission, the number of output obtained is




8. The method using which the error propagation in dubinary signalling can be avoided is




9. In precoding technique, the binary sequence is _____ with the previous precoded bit.




10. The duobinary filter, He (f) is called as




11. The method which has greater bandwidth efficiency is called as




12. In polybinary signalling method the present bit of binary sequence is algebraically added with ______ number of previous bits.




13. The primary advantage of this method is




14. Source encoding procedure does




15. Which signals are function of time?




16. Auto-correlation function is a




17. Shot noise occurs in




18. Source coding reduces




19. Delay element in delta modulation acts as




20. Non uniform quantization includes




21. The quantization will be finer when




22. Different cases of sampling include




23. Transmitted pulse becomes distorted due to




24. In which mixing is easier?




25. Which filter does not have sharp output?




26. Using ARMA filter




27. To avoid aliasing




28. Which requires interpolation filtering?




29. A to D conversion process uses




30. Reconstruction filter is difficult to implement in hardware.




31. Which process requires low pass filter?




32. Decreasing the data rate is called as




33. Original signal came to be retraced from sampled version using




34. The signal can be reconstructed




35. Which device is needed for the reconstruction of signal?




36. The term heterodyning refers to




37. The causes for error performance degradation in communication systems are




38. Thermal noise in the communication system due to thermal electrons




39. White noise has _______ power spectral density.




40. Which are called as hard decisions?




41. The filter which is used to recover the pulse with less ISI is called as




42. The composite equalizing filter is the combination of




43. The sample from the demodulation process consists of sample which is _______ to energy of the received symbol and _____ to noise.




44. The average noise power of white noise is




45. The channel may be affected by




46. Channels display multi-path due to




47. The method in which the tail of one pulse smears into adjacent symbol interval is called as




48. If each pulse of the sequence to be detected is in _____ shape, the pulse can be detected without ISI.




49. What is symbol rate packing?




50. A nyquist pulse is the one which can be represented by _____ shaped pulse multiplied by another time function.