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Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-8

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1. Orthogonal vectors are




2. In orthogonal signalling as k increase there is




3. In non orthogonal signalling as k increases there is




4. In orthogonal signal, all cross correlation coefficients are




5. The smaller the cross correlation, the ______ is the distance between the signal vectors.




6. Biorthogonal set consists of




7. Which codes perform better?




8. Biorthogonal codes needs ________ bandwidth as orthogonal codes.




9. Transorthogonal code is obtained by




10. Which code requires minimum Eb/N0?




11. In binary symmetric channel, in the demodulator _____ decision is made.




12. In Gaussian channel demodulator ______ decision is made.




13. Which decoders are less complex?




14. The ratio of redundant bits to data bits is called as




15. If the parity bit takes value one then the summation of code-word gives




16. The summation operation is performed using _____ logical operation.




17. The probability of message error is written as




18. In a real time communication system addition of redundant bits leads to




19. Coding gain is defined as




20. The capacity per cell is ______ Eb/N0.




21. Hamming distance can be given by the number of elements in which




22. Code strength is characterized by its




23. The distance between two code-words is equal to the _____ of the third code-word which is the sum of the first two code-words.




24. Error detecting capability is given as




25. The minimum distance Dmin can also be given as




26. The number of errors that can be corrected without erasure information is




27. For better efficiency and simplicity, n should be




28. Nyquist frequency is given by




29. Some various types of distortion are




30. Noise which can affect sampling are




31. Oversampling can completely eliminate




32. Sampling can be used in




33. What is the bit depth used for audio recording?




34. Which factors are measured using the units of lines per picture height?




35. Sampling of simultaneously two different but related wave-forms is called as




36. Sampling can be done for functions varying in




37. Reconstruction of continuous signals is done using




38. The cyclic codes are designed using




39. A cyclic code can be generated using




40. The feedback shift register circuit is called as




41. In the dividing circuit, the parity polynomial is obtained by the




42. The received code contains an error if the syndrome vector is




43. Block codes are generated using




44. Extended go-lay code is formed by




45. Block length is the _____________ in the code word.




46. The rate of a block code is the ration of




47. Linear codes are used for




48. The k-bit message forms ____ distinct messages which is referred to as k-tuples.




49. The sum of any two vectors in subset S is also in S. This is called as




50. To avoid corruption during transmission, the code-word should be