MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Autocorrelation function of periodic signal is equal to _______ |
| A. | Energy of the signal |
| B. | Power of the signal |
| C. | Its area in frequency domain |
| D. | None of the mentioned |
| Answer» C. Its area in frequency domain | |
| 2. |
Autocorrelation is maximum at _______ |
| A. | Unity |
| B. | Origin |
| C. | Infinite point |
| D. | None of the mentioned |
| Answer» C. Infinite point | |
| 3. |
Autocorrelation is a function of |
| A. | Time |
| B. | Frequency |
| C. | Time difference |
| D. | Frequency difference |
| Answer» D. Frequency difference | |
| 4. |
Autocorrelation is a function which matches |
| A. | Two same signals |
| B. | Two different signal |
| C. | One signal with its delayed version |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 5. |
According to Parseval’s theorem the energy spectral density curve is equal to? |
| A. | Area under magnitude of the signal |
| B. | Area under square of the magnitude of the signal |
| C. | Area under square root of magnitude of the signal |
| D. | None of the mentioned |
| Answer» C. Area under square root of magnitude of the signal | |
| 6. |
AUTOCORRELATION_IS_A_FUNCTION_OF?$ |
| A. | Time |
| B. | Frequency |
| C. | Time difference |
| D. | Frequency difference |
| Answer» D. Frequency difference | |
| 7. |
Autocorrelation function of periodic signal is equal to _______$ |
| A. | Energy of the signal |
| B. | Power of the signal |
| C. | Its area in frequency domain |
| D. | None of the mentioned |
| Answer» C. Its area in frequency domain | |
| 8. |
Autocorrelation_is_maximum_at________$ |
| A. | Unity |
| B. | Origin |
| C. | Infinite point |
| D. | None of the mentioned |
| Answer» C. Infinite point | |
| 9. |
Autocorrelation function of white noise will have? |
| A. | Strong peak |
| B. | Infinite peak |
| C. | Weak peak |
| D. | None of the mentioned |
| Answer» B. Infinite peak | |
| 10. |
Autocorrelation is a _______ function. |
| A. | Real and even |
| B. | Real and odd |
| C. | Complex and even |
| D. | Complex and odd |
| Answer» B. Real and odd | |
| 11. |
Autocorrelation is a function which matche? |
| A. | Two same signals |
| B. | Two different signal |
| C. | One signal with its delayed version |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
Spectogram is the graph plotted against? |
| A. | Frequency domain |
| B. | Time domain |
| C. | Frequency & Time domain |
| D. | None of the mentioned |
| Answer» C. Frequency & Time domain | |
| 13. |
According to Parseval’s theorem the energy spectral density curve is equal to?$ |
| A. | Area under magnitude of the signal |
| B. | Area under square of the magnitude of the signal |
| C. | Area under square root of magnitude of the signal |
| D. | None of the mentioned |
| Answer» C. Area under square root of magnitude of the signal | |
| 14. |
What is Wiener-Khinchin theorem? |
| A. | Spectral density and auto-covariance makes a fourier transform pair |
| B. | Spectral density and auto-correlatioon makes a fourier tranform pair |
| C. | Spectral density and variance makes a fourier tranform pair |
| D. | None of the mentioned |
| Answer» C. Spectral density and variance makes a fourier tranform pair | |
| 15. |
How can power spectral density of non periodic signal be calculated? |
| A. | By integrating |
| B. | By truncating |
| C. | By converting to periodic |
| D. | None of the mentioned |
| Answer» C. By converting to periodic | |
| 16. |
Power spectrum describes distribution of _________ under frequency domain. |
| A. | Mean |
| B. | Variance |
| C. | Gaussian |
| D. | None of the mentioned |
| Answer» C. Gaussian | |
| 17. |
Energy spectral density defines |
| A. | Signal energy per unit area |
| B. | Signal energy per unit bandwidth |
| C. | Signal power per unit area |
| D. | Signal power per unit bandwidth |
| Answer» C. Signal power per unit area | |
| 18. |
Power spectral density function is a? |
| A. | Real and even function |
| B. | Non negative function |
| C. | Periodic |
| D. | All of the mentioned |
| Answer» E. | |