MCQOPTIONS
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MCQOPTIONS
This section includes 15 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_SYSTEM_ALLOWS_LARGER_PROCESSING_GAIN??$ |
| A. | Direct sequence |
| B. | Frequency hopping |
| C. | Direct sequence & Frequency hopping |
| D. | None of the mentioned |
| Answer» C. Direct sequence & Frequency hopping | |
| 2. |
Which type of demodulator is used in the frequency hopping technique?$ |
| A. | Coherent |
| B. | Non coherent |
| C. | Coherent & Non coherent |
| D. | None of the mentioned |
| Answer» C. Coherent & Non coherent | |
| 3. |
In which technique is phase coherence hard to maintain?$ |
| A. | Direct sequence |
| B. | Frequency hopping |
| C. | Direct sequence & Frequency hopping |
| D. | None of the mentioned |
| Answer» C. Direct sequence & Frequency hopping | |
| 4. |
Which duration is shorter? |
| A. | Hop duration |
| B. | Symbol duration |
| C. | Chip duration |
| D. | None of the mentioned |
| Answer» B. Symbol duration | |
| 5. |
Fast frequency hopping is |
| A. | Several modulations per hop |
| B. | Several modulations per symbol |
| C. | Several symbols per modulation |
| D. | None of the mentioned |
| Answer» E. | |
| 6. |
Slow frequency hopping is |
| A. | Several hops per modulation |
| B. | Several modulations per hop |
| C. | Several symbols per modulation |
| D. | None of the mentioned |
| Answer» C. Several symbols per modulation | |
| 7. |
Chips are the |
| A. | Repeated symbols |
| B. | Non repeated symbols |
| C. | Smallest length symbols |
| D. | None of the mentioned |
| Answer» B. Non repeated symbols | |
| 8. |
Robustness gives the inability of a signal to withstand the impairments. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
The minimum spacing between consecutive hop positions gives th? |
| A. | Minimum number of chips necessary |
| B. | Maximum number of chips necessary |
| C. | Chip rate |
| D. | None of the mentioned |
| Answer» B. Maximum number of chips necessary | |
| 10. |
The frequency hopping system uses ______ modulation scheme. |
| A. | FSK |
| B. | BPSK |
| C. | MFSK |
| D. | MPSK |
| Answer» D. MPSK | |
| 11. |
Which modulation scheme is preferred for direct sequence spread spectrum process? |
| A. | BPSK |
| B. | QPSK |
| C. | BPSK & QPSK |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
Chip is defined as |
| A. | Shortest uninterrupted waveform |
| B. | Largest uninterrupted waveform |
| C. | Shortest diversion |
| D. | None of the mentioned |
| Answer» B. Largest uninterrupted waveform | |
| 13. |
The processing gain is given as |
| A. | Wss/R |
| B. | R/Wss |
| C. | Wss/2R |
| D. | R/2Wss |
| Answer» B. R/Wss | |
| 14. |
In direct sequence process which step is performed first? |
| A. | De-spreading |
| B. | Demodulation |
| C. | Despreading & Demodulation |
| D. | None of the mentioned |
| Answer» B. Demodulation | |
| 15. |
DS/BPSK includes |
| A. | Despreading |
| B. | Demodulation |
| C. | Despreading & Demodulation |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |