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. |
Entropy calculation returns |
| A. | Random variable |
| B. | Deterministic number |
| C. | Random number |
| D. | None of the mentioned |
| Answer» C. Random number | |
| 2. |
Which provides more secure communication? |
| A. | CDMA |
| B. | FDMA |
| C. | TDMA |
| D. | None of the mentioned |
| Answer» B. FDMA | |
| 3. |
In TDM, at the receiver end, ____ filter is used. |
| A. | Low pass |
| B. | High pass |
| C. | Band pass |
| D. | Band stop |
| Answer» B. High pass | |
| 4. |
WHICH_PROVIDES_MORE_SECURE_COMMUNICATION??$ |
| A. | CDMA |
| B. | FDMA |
| C. | TDMA |
| D. | None of the mentioned |
| Answer» B. FDMA | |
| 5. |
Entropy calculation returns$ |
| A. | Random variable |
| B. | Deterministic number |
| C. | Random number |
| D. | None of the mentioned |
| Answer» C. Random number | |
| 6. |
Entropy is the measure of$ |
| A. | Randomness |
| B. | Information |
| C. | Randomness & Information |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
Entropy of N random variables is the _____ of the entropy of individual random variable. |
| A. | Sum |
| B. | Product |
| C. | Sum of squares |
| D. | Average |
| Answer» B. Product | |
| 8. |
In TDM, at the receiver end, ____ filter is used? |
| A. | Low pass |
| B. | High pass |
| C. | Band pass |
| D. | Band stop |
| Answer» B. High pass | |
| 9. |
Time division multiplexing uses |
| A. | High pass filter |
| B. | Commutator |
| C. | High pass filter & Commutator |
| D. | None of the mentioned |
| Answer» C. High pass filter & Commutator | |
| 10. |
Which has higher error probability performance? |
| A. | Uni-polar base-band signalling |
| B. | Bipolar base-band signalling |
| C. | ASK |
| D. | FSK |
| Answer» C. ASK | |
| 11. |
Which has same probability of error? |
| A. | ASK and FSK |
| B. | ASK and PSK |
| C. | PSK and FSK |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
Matched filter |
| A. | Is a non linear filter |
| B. | Produces maximum output SNR |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 13. |
Modulation process corresponds to ______ the amplitude, frequency or phase. |
| A. | Switching |
| B. | Keying |
| C. | Switching or keying |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 14. |
For which quantization process is used? |
| A. | Amplitude discretization |
| B. | Time discretization |
| C. | Amplitude & Time discretization |
| D. | None of the mentioned |
| Answer» B. Time discretization | |
| 15. |
PCM includes the process of |
| A. | Amplitude discretization |
| B. | Time discretization |
| C. | Amplitude & Time discretization |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |