MCQOPTIONS
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MCQOPTIONS
This section includes 22 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. |
In which modulation schemes, the spreading of spectrum occurs? |
| A. | Frequency modulation |
| B. | Amplitude modulation |
| C. | Frequency & Amplitude modulation |
| D. | None of the mentioned |
| Answer» B. Amplitude modulation | |
| 2. |
In Aloha technique, the re-transmission takes place immediately. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Which technique needs precise synchronization? |
| A. | TDMA |
| B. | FDMA |
| C. | TDMA & FDMA |
| D. | None of the mentioned |
| Answer» B. FDMA | |
| 4. |
Uncertainty in the delay measurement is _______ to rise time of the pulse. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Not related |
| D. | None of the mentioned |
| Answer» B. Inversely proportional | |
| 5. |
For a throughput of value less than 0.20, which has less average delay? |
| A. | S-ALOHA |
| B. | Pure ALOHA |
| C. | R-ALOHA |
| D. | None of the mentioned |
| Answer» B. Pure ALOHA | |
| 6. |
Which are non orthogonal multiplexing? |
| A. | TDM |
| B. | FDM |
| C. | TDM & FDM |
| D. | None of the mentioned |
| Answer» E. | |
| 7. |
A mechanism for breaking the problem down is |
| A. | Layering |
| B. | Dividing |
| C. | Abstraction |
| D. | Entity sharing |
| Answer» D. Entity sharing | |
| 8. |
CDMA uses |
| A. | Hard hand off |
| B. | Soft hand off |
| C. | Hard & Soft hand off |
| D. | None of the mentioned |
| Answer» C. Hard & Soft hand off | |
| 9. |
CDMA rejects |
| A. | Narrow band interference |
| B. | Wide band interference |
| C. | Narrow & Wide band interference |
| D. | None of the mentioned |
| Answer» B. Wide band interference | |
| 10. |
The minimum packet size of Ethernet is |
| A. | 81 bytes |
| B. | 75 bytes |
| C. | 72 bytes |
| D. | 64 bytes |
| Answer» D. 64 bytes | |
| 11. |
Which is more costlier? |
| A. | TDMA |
| B. | FDMA |
| C. | ALOHA |
| D. | None of the mentioned |
| Answer» B. FDMA | |
| 12. |
In SPADE system, the carrier is done based on |
| A. | Fixed assignment |
| B. | Demand assignment |
| C. | Fixed & Demand assignment |
| D. | None of the mentioned |
| Answer» C. Fixed & Demand assignment | |
| 13. |
Minimum packet size increases as |
| A. | Speed increases |
| B. | Distance increases |
| C. | Speed & Distance increases |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 14. |
Companding is used to |
| A. | Increase the information transmission rate |
| B. | Use only one carrier frequency to handle different signals |
| C. | To use different frequency bands for different signals |
| D. | To protect all small signals in PCM from quantizing noise |
| Answer» E. | |
| 15. |
In which technique, packet size are constant? |
| A. | Pure Aloha |
| B. | Slotted Aloha |
| C. | Pure & Slotted Aloha |
| D. | None of the mentioned |
| Answer» B. Slotted Aloha | |
| 16. |
The preamble consists of |
| A. | Synchronization |
| B. | Addressing |
| C. | Error control sequence |
| D. | All of the mentioned |
| Answer» E. | |
| 17. |
Which method is efficient? |
| A. | Fixed assignment |
| B. | Dynamic allocation |
| C. | Fixed assignment & Dynamic allocation |
| D. | None of the mentioned |
| Answer» C. Fixed assignment & Dynamic allocation | |
| 18. |
In spread spectrum technique, the desired signal is multiplied _____ and interference signal is multiplied _____ |
| A. | Once, twice |
| B. | Twice, once |
| C. | Twice, thrice |
| D. | Thrice, twice |
| Answer» C. Twice, thrice | |
| 19. |
For a throughput value of 0.20 to 0.67, which has less average delay? |
| A. | S-ALOHA |
| B. | Pure ALOHA |
| C. | R-ALOHA |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 20. |
Each satellite has ______ transponders. |
| A. | 10 |
| B. | 12 |
| C. | 15 |
| D. | 18 |
| Answer» C. 15 | |
| 21. |
In digital communication, interaction between ______ is possible. |
| A. | Any layer to layer |
| B. | One layer to next layer |
| C. | layers |
| D. | None of the mentioned |
| Answer» C. layers | |
| 22. |
Frequency planning is very essential in |
| A. | FDMA |
| B. | TDMA |
| C. | FDMA & TDMA |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |