Electrical measurements MCQ Quiz Hub

Digital Communications MCQs set-3

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

1. Modulation channel consists of




2. Modulation channel does not accept an analog input signal.




3. If operating frequency bands are higher ______ is available.




4. Ground wave communication occurs in




5. Sampling theorem is used for converting




6. A signal can be recovered from its sample by using




7. Which is practically realizable?




8. In flat top sampling scheme, ______ is kept constant after sampling.




9. Loop filter is a ______ used to reduce noise.




10. A stationary stochastic process has




11. The power spectral density function of the stochastic process is




12. For a periodic function, the spectral density and auto correlation functions form




13. The capacity of a channel is given by




14. In a communication system, a process in which statistical averages and time averages are equal is called as




15. A rectangular pulse of duration T is applied to a matched filter. The output of the filter is a




16. The line code has a zero dc component for pulse transmission of random binary data is




17. The auto-correlation of white noise is




18. Ionospheric communication can take place in




19. Satellite communication takes place in




20. The weighing matrix is




21. Non uniform tree _____ bit rate.




22. Two clock with rates T1 and T2 are incommensurate if its ratio is




23. Possible timing error detection methods are




24. Which has minimum power loss during transmission?




25. Voltage generated by lightning is an example for




26. In the digital communication system, signals in different frequency bands are




27. Properties of impulse function are




28. Properties of Fourier transform are




29. A base-band signal can be up-converted using




30. A band-pass signal can be down-converted using




31. In down-conversion multiplication with cosine wave is followed by




32. ADSL has _____ information channels.




33. Fourier transform of a signal gives the




34. Random things in a communication system are




35. Which can be used for periodic and non periodic?




36. A band-pass signal has a Fourier transform equal to




37. Which are orthonormal signal representation?




38. Constellation diagram is plotted in




39. Cumulative distributive function is




40. Which are non negative functions?




41. The sampling process includes methods such as




42. The output of sampling process are called as ________




43. According to Sampling theorem




44. The fourier tranform of one impulse train is also another impulse train with a period of the output equal to the




45. The process in which the top of each pulse in the output samples retains the shape of the analog segment is called as ________




46. The effects of aliasing are ________




47. Aliasing can be removed using




48. Which process is more economical?




49. Flat top sampling or practical sampling has




50. Multiplication of input signal with pulse train is done in ________ sampling.