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Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-12

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

1. Entropy calculation returns




2. Entropy of N random variables is the _____ of the entropy of individual random variable.




3. Average energy per bit is given by




4. Which FSK has no phase discontinuity?




5. FSK reception is




6. FSK reception uses




7. In non coherent reception _____ is measured.




8. Every frequency has ____ orthogonal functions.




9. If we correlate the received signal with any one of the two orthogonal function, the obtained inner product will be




10. If we correlate the received signal with both orthogonal function the inner product will be




11. Simulation is used to determine




12. Matched filter is a _____ technique.




13. Which is called as on-off keying?




14. QAM uses ______ as the dimensions.




15. Which system uses QAM?




16. In phase lock which parameter is synchronized




17. Coherent modulation requires ____ level of synchronization.




18. Non coherent system requires




19. For block codes _____ is necessary.




20. The synchronization necessary for BPSK is




21. Transmitter synchronization implies




22. As the synchronization levels increases, cost




23. Synchronization is used in system which has




24. Which method has fast acquisition and can work without return link?




25. Which method has two way link?




26. Which method requires external authority and is inflexible?




27. Which method needs precorrect time?




28. In open loop method, the time reference error __________ with respect to time.




29. When a terminal is able to utilize the measurements made on the return link it is called as




30. Which reduces the effective distance between signals in signal space?




31. The system which has ______ signal to noise ratio can tolerate larger timing error.




32. Phase locked loops consists of




33. In VCO the output frequency is a linear function of its input




34. PLL designs have




35. A cycle slip occurs when the magnitude of the original phase error exceeds




36. When phase noise and phase jitter is doubled, the phase variance increases by




37. Acquisition is a ______ operation.




38. To avoid the loop to be driven to lock, the sweep rate should be




39. Which method is more accurate?




40. What is the function of the edge detector?




41. Continuous phase modulation has




42. CPM has




43. The number of filters in CPM receiver structure is




44. In which modulation schemes, the spreading of spectrum occurs?




45. Gaussian noise has _____ power spread _____ over all frequencies.




46. Jamming is caused by




47. Which system makes the detection difficult for all users other than the intended users?




48. The radio meter consists of




49. Spread spectrum signals are used for




50. Uncertainty in the delay measurement is _________ to the bandwidth of signal pulse.