MCQOPTIONS
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MCQOPTIONS
This section includes 19 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. |
Which has same probability of error? |
| A. | BPSK and QPSK |
| B. | BPSK and ASK |
| C. | BPSK and PAM |
| D. | BPSK and QAM |
| Answer» D. BPSK and QAM | |
| 2. |
QAM uses ______ as the dimensions. |
| A. | In phase |
| B. | Quadrature |
| C. | In phase & Quadrature |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
Which is called as on-off keying? |
| A. | Amplitude shift keying |
| B. | Uni-polar PAM |
| C. | Amplitude shift keying & Uni-polar PAM |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
Matched filter is a _____ technique. |
| A. | Modulation |
| B. | Demodulation |
| C. | Modulation & Demodulation |
| D. | None of the mentioned |
| Answer» C. Modulation & Demodulation | |
| 5. |
Simulation is used to determine |
| A. | Bit error rate |
| B. | Symbol error rate |
| C. | Bit error |
| D. | Symbol error |
| Answer» B. Symbol error rate | |
| 6. |
If we correlate the received signal with both orthogonal function the inner product will be |
| A. | In phase |
| B. | Quadrature |
| C. | In phase and quadrature |
| D. | Unity |
| Answer» D. Unity | |
| 7. |
MATCHED_FILTER_IS_A_______TECHNIQUE.?$ |
| A. | Modulation |
| B. | Demodulation |
| C. | Modulation & Demodulation |
| D. | None of the mentioned |
| Answer» C. Modulation & Demodulation | |
| 8. |
SIMULATION_IS_USED_TO_DETERMINE?$ |
| A. | Bit error rate |
| B. | Symbol error rate |
| C. | Bit error |
| D. | Symbol error |
| Answer» B. Symbol error rate | |
| 9. |
QAM uses ______ as the dimensions.$ |
| A. | In phase |
| B. | Quadrature |
| C. | In phase & Quadrature |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 10. |
Which is called as on-off keying?$ |
| A. | Amplitude shift keying |
| B. | Uni-polar PAM |
| C. | Amplitude shift keying & Uni-polar PAM |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 11. |
Which system uses QAM? |
| A. | Digital microwave relay |
| B. | Dial up modem |
| C. | Digital microwave relay & Dial up modem |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
If we correlate the received signal with both orthogonal function the inner product will b? |
| A. | In phase |
| B. | Quadrature |
| C. | In phase and quadrature |
| D. | Unity |
| Answer» D. Unity | |
| 13. |
If we correlate the received signal with any one of the two orthogonal function, the obtained inner product will be |
| A. | In phase |
| B. | Quadrature |
| C. | Zero |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 14. |
Every frequency has ____ orthogonal functions. |
| A. | One |
| B. | Two |
| C. | Four |
| D. | Six |
| Answer» C. Four | |
| 15. |
In non coherent reception _____ is measured. |
| A. | Phase |
| B. | Energy |
| C. | Power |
| D. | None of the mentioned |
| Answer» C. Power | |
| 16. |
FSK reception uses |
| A. | Correlation receiver |
| B. | PLL |
| C. | Correlation receiver & PLL |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 17. |
FSK reception is |
| A. | Phase Coherent |
| B. | Phase non coherent |
| C. | Phase Coherent & non coherent |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 18. |
Which FSK has no phase discontinuity? |
| A. | Continuous FSK |
| B. | Discrete FSK |
| C. | Uniform FSK |
| D. | None of the mentioned |
| Answer» B. Discrete FSK | |
| 19. |
Average energy per bit is given by |
| A. | average energy symbol/log2 M |
| B. | average energy symbol * log2 M |
| C. | log2 M/ Average energy symbol |
| D. | none of the mentioned |
| Answer» B. average energy symbol * log2 M | |