MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
As limit of k increases, the ratio of PB/PE becomes |
| A. | 1:2 |
| B. | 2:1 |
| C. | 1:3 |
| D. | 3:1 |
| Answer» B. 2:1 | |
| 2. |
Energy per symbol Es is given as |
| A. | Es=Eb(log2M) |
| B. | Es=Eb/(log2M) |
| C. | Es=2Eb(log2M) |
| D. | Es=Eb/2(log2M) |
| Answer» B. Es=Eb/(log2M) | |
| 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. |
The relation between the probability of bit error and probability of symbol error in M-ary orthogonal signalling is |
| A. | M/M-1 |
| B. | 2M/M-1 |
| C. | (M/2)/M-1 |
| D. | M/M+1 |
| Answer» D. M/M+1 | |
| 5. |
For FSK signalling, WT is equal to |
| A. | 0 |
| B. | 1 |
| C. | 0.737 |
| D. | Infinity |
| Answer» C. 0.737 | |
| 6. |
The detection method where carrier's phase is given importance is called as |
| A. | Coherent detection |
| B. | Non coherent detection |
| C. | Coherent detection & Non coherent detection |
| D. | None of the mentioned |
| Answer» B. Non coherent detection | |
| 7. |
In amplitude phase keying each phase vector is separated by |
| A. | 90 |
| B. | 0 |
| C. | 45 |
| D. | 180 |
| Answer» D. 180 | |
| 8. |
The transformation of the waveform into a single point in signal space is called as |
| A. | Vector point |
| B. | Predetection point |
| C. | Preamplification point |
| D. | Transformation point |
| Answer» C. Preamplification point | |
| 9. |
In differential encoding the _________ different between two wave forms is measured. |
| A. | Magnitude |
| B. | Frequency |
| C. | Phase |
| D. | Time period |
| Answer» D. Time period | |