MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 18 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 jammer which monitors a communicator’s signal is known as |
| A. | Frequency follower jammers |
| B. | Repeat back jammers |
| C. | Frequency follower & Repeat back jammers |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 2. |
WHICH_METHOD_IS_BETTER??$ |
| A. | To share same bandwidth |
| B. | To share different bandwidth |
| C. | To share same & different bandwidth |
| D. | None of the mentioned |
| Answer» C. To share same & different bandwidth | |
| 3. |
Which are the design options for anti jam communicator?$ |
| A. | Time diversity |
| B. | Frequency diversity |
| C. | Special discrimination |
| D. | All of the mentioned |
| Answer» E. | |
| 4. |
Pulse_jammer_consists_of$ |
| A. | Pulse modulated excess band noise |
| B. | Pulse modulated band-limited noise |
| C. | Pulse width modulated excess band noise |
| D. | Pulse width modulated band-limited noise |
| Answer» C. Pulse width modulated excess band noise | |
| 5. |
The jammer which monitors a communicator’s signal is known as$ |
| A. | Frequency follower jammers |
| B. | Repeat back jammers |
| C. | Frequency follower & Repeat back jammers |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 6. |
Which jamming method produces greater degradation? |
| A. | Broadband jamming |
| B. | Partial jamming |
| C. | Broadband & Partial jamming |
| D. | None of the mentioned |
| Answer» C. Broadband & Partial jamming | |
| 7. |
To increase error probability, the processing gain should be |
| A. | Increased |
| B. | Decreased |
| C. | Exponentially increased |
| D. | Exponentially decreased |
| Answer» B. Decreased | |
| 8. |
The broadband jammer jams the entire |
| A. | W |
| B. | Wss |
| C. | W & Wss |
| D. | None of the mentioned |
| Answer» C. W & Wss | |
| 9. |
The system should have |
| A. | Larger (J/S)reqd |
| B. | Greater system’s noise rejection capability |
| C. | Larger (J/S)reqd & Greater system’s noise rejection capability |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 10. |
The_ratio_(J/S)reqd_gives_the_measure_of |
| A. | Vulnerability to interference |
| B. | Invulnerability to interference |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 11. |
For any cyclic shift, the auto-correlation function is equal t? |
| A. | 1/p |
| B. | -1/p |
| C. | –p |
| D. | p |
| Answer» C. ‚Äö√Ñ√∂‚àö√ë‚àö¬®p | |
| 12. |
For maximal length sequence, the sequence repetition clock pulses p is given by |
| A. | 2n + 1 |
| B. | 2n -1 |
| C. | 2n |
| D. | None of the mentioned |
| Answer» C. 2n | |
| 13. |
The sequences produced by shift register depends on |
| A. | Number of stages |
| B. | Feedback tap connections |
| C. | Initial conditions |
| D. | All of the mentioned |
| Answer» E. | |
| 14. |
If the initial pulse of 1000 is fed to shift register, after how many clock pulses does the sequence repeat? |
| A. | 15 |
| B. | 16 |
| C. | 14 |
| D. | 17 |
| Answer» B. 16 | |
| 15. |
A linear feedback shift register consists of |
| A. | Feedback path |
| B. | Modulo 2 adder |
| C. | Four stage register |
| D. | All of the mentioned |
| Answer» E. | |
| 16. |
The shift register needs to be controlled by clock pulses. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
The properties used for pseudorandom sequence are |
| A. | Balance |
| B. | Run |
| C. | Correlation |
| D. | All of the mentioned |
| Answer» E. | |
| 18. |
Pseudorandom signal ________ predicted. |
| A. | Can be |
| B. | Cannot be |
| C. | maybe |
| D. | None of the mentioned |
| Answer» B. Cannot be | |