Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-4

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

1. The main sources of corruption are




2. The distortion in quantization is called as




3. In quantization process, the amount of quantization noise is _______________ to number of levels.




4. Saturation noises can be avoided or reduced by




5. Timing jitter can be reduced by




6. The reasons for the threshold effect are




7. When channel bandwidth is greater than the pulse bandwidth, it causes




8. The _____________ corresponds to average quantization noise power.




9. Signal to noise ratio increases as ___________ increases.




10. Signal to noise ratio is infinite when




11. The length of the code-word obtained by encoding quantized sample is equal to




12. Quantization noise can be reduced by ________ the number of levels.




13. In PCM encoding, quantization level varies as a function of ________




14. What is bit depth?




15. Choosing a discrete value that is near but not exactly at the analog signal level leads to




16. In PCM the samples are dependent on ________




17. DPCM encodes the PCM values based on




18. Delta modulation uses _____ bits per sample.




19. Sample resolution for LPCM ____ bits per sample.




20. Adaptive DPCM is used to




21. The size of the quantile interval is called as




22. Uniform quantization provides better quantization for




23. Non uniform quantization provides better quantization for




24. In non uniform quantization, the quantization noise is _______ to signal size.




25. The output SNR can be made independent of input signal level by using




26. Companding is the process of




27. Which value of μ corresponds to linear amplification?




28. What is the standard value of μ in μ-law ?




29. The standard value of A in A-law is




30. Which type of quantization is most preferable for audio signals for a human ear?




31. Which waveforms are also called as line codes?




32. When pulse code modulation is applied to non binary symbols we obtain waveform called as




33. Examples of PCM waveforms are




34. Which type is used and preferred in digital logic circuits?




35. Which method is called as differential encoding?




36. Which method is preferred in magnetic tape recording?




37. NRZ-S is complement of _______




38. The return to zero waveform consists of




39. Phase encoded group consists of




40. In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?




41. In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?




42. In which waveform logic 1 is represented by equal amplitude alternating pulses?




43. Application of phase encoded binary signals are




44. In which waveform one is represented by half bit wide pulse positioned during the first half and zero is represented by half bit wide pulse positioned in the second half?




45. Which binary waveform uses three levels?




46. Which waveform type has the feature of clocking?




47. Which waveform has the feature of error detection?




48. Which waveform scheme introduces bandwidth compression?




49. Which waveform type has better noise immunity?




50. In pulse modulation, reciprocal of T(time) is