MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
The error probability of DPSK is ________ worse than PSK. |
| A. | Twiceb) 3 dbc) Twice (3d |
| B. | 3 db |
| C. | Twice (3db) |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 2. |
In differential encoding the _________ different between two wave forms is measured. |
| A. | Magnitude |
| B. | Frequency |
| C. | Phase |
| D. | Time period |
| Answer» D. Time period | |
| 3. |
THE_ERROR_PROBABILITY_OF_DPSK_IS__________WORSE_THAN_PSK.?$ |
| A. | Twice |
| B. | 3 db |
| C. | Twice (3db) |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
In differential encoding the _________ different between two wave forms is measured? |
| A. | Magnitude |
| B. | Frequency |
| C. | Phase |
| D. | Time period |
| Answer» D. Time period | |
| 5. |
Matched filter is used for |
| A. | Coherent detection |
| B. | Non coherent detection |
| C. | Coherent & Non coherent detection |
| D. | None of the mentioned |
| Answer» B. Non coherent detection | |
| 6. |
The minimum tone separation corresponds to |
| A. | T |
| B. | 1/T |
| C. | 2T |
| D. | T/2 |
| Answer» C. 2T | |
| 7. |
The minimum required spacing is the difference between the |
| A. | Center of the spectral main lobe and first zero crossing |
| B. | First and second zero crossing |
| C. | First and last zero crossing |
| D. | None of the mentioned |
| Answer» B. First and second zero crossing | |
| 8. |
Envelope detector consists of |
| A. | Rectifier and high pass filter |
| B. | Rectifier and low pass filter |
| C. | Amplifier and low pass filter |
| D. | Amplifier and high pass filter |
| Answer» C. Amplifier and low pass filter | |
| 9. |
In differential PSK the date is |
| A. | Encoded differentially |
| B. | Decoded differentially |
| C. | Encoded & Decoded differentially |
| D. | None of the mentioned |
| Answer» B. Decoded differentially | |
| 10. |
Phase-locked loop circuitry is used for |
| A. | Carrier wave recovery |
| B. | Phase estimation |
| C. | Carrier wave recovery & Phase estimation |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 11. |
The minimum nyquist sampling rate is given as, fs = |
| A. | 1/T |
| B. | T |
| C. | 2/T |
| D. | 2T |
| Answer» B. T | |
| 12. |
The correlating detector is also known as |
| A. | Maximum likelihood detector |
| B. | Minimum likelihood detector |
| C. | Maximum & Minimum likelihood detector |
| D. | None of the mentioned |
| Answer» B. Minimum likelihood detector | |