Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-6

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

1. Which value of r (roll off factor) is considered as Nyquist minimum bandwidth case?




2. A pulse shaping filter should satisfy two requirements. They are




3. Examples of double side band signals are




4. Channel’s phase response must be a linear function of




5. Amplitude distortion occurs when




6. Phase distortion occurs when




7. Equalization process includes




8. The maximum likelihood sequence estimator adjusts _______ according to _____ environment.




9. The filters used with the equalizer is of ______ types.




10. Transversal equalizers are ________ and decision feedback equalizers are ______




11. Symbol spaced has ____ sample per symbol and fractionally spaced has ___ samples per symbol.




12. The _______ of the opening of eye pattern indicates the time over which the sampling for detection might be performed.




13. Range of time difference of the zero crossing gives the value of




14. The range of amplitude difference gives the value of




15. As the eye opens, ISI _______




16. Pseudo noise signal has _______ and _______ SNR for the same peak transmitted power.




17. The index value n, in transversal filter can be used as.




18. The over-determined set of equations can be solved using




19. If the filter’s tap weight remains fixed during transmission of data, then the equalization is called as




20. Equalization method which is done by tracking a slowly time varying channel response is




21. Preamble is used for




22. The disadvantage of preset equalizer is that




23. For AWGN, the noise variance is




24. Performance of BFSK signal is ________ than BPSK.




25. A Gaussian distribution into the non linear envelope detector yields




26. The non coherent FSK needs ________ Eb/N0 than coherent FSK.




27. The DPSK needs ________ Eb/N0 than BPSK.




28. Coherent PSK and non coherent orthogonal FSK have a difference of ______ in PB.




29. Which is easier to implement and is preferred?




30. Which is the main system consideration?




31. Wavelength and antenna size are related as




32. The detection method where carrier’s phase is given importance is called as




33. The coherent modulation techniques are




34. The real part of a sinusoid carrier wave is called as




35. Antipodal signal sets are those vectors that can be illustrated as




36. The FSK signal which has a gentle shift from one frequency level to another is called as




37. Which modulation scheme is also called as on-off keying method?




38. In amplitude phase keying each phase vector is separated by




39. The transformation of the waveform into a single point in signal space is called as




40. The correlating detector is also known as




41. The minimum nyquist sampling rate is given as, fs =




42. Phase-locked loop circuitry is used for




43. In differential PSK the date is




44. Envelope detector consists of




45. The minimum required spacing is the difference between the




46. The minimum tone separation corresponds to




47. Matched filter is used for




48. In differential encoding the _________ different between two wave forms is measured.




49. The error probability of DPSK is ________ worse than PSK.




50. The limit which represents the threshold Eb/N0 value below which reliable communication cannot be maintained is called as