MCQOPTIONS
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MCQOPTIONS
This section includes 21 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. |
Non uniform tree _____ bit rate. |
| A. | Increases |
| B. | Decreases |
| C. | Does not affect |
| D. | None of the mentioned |
| Answer» B. Decreases | |
| 2. |
The weighing matrix is |
| A. | Positive quantity |
| B. | Inverse of covariance matrix of the input vector |
| C. | Positive quantity & Inverse of a covariance matrix of the input vector |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
Satellite communication takes place in |
| A. | Ultra high frequency band |
| B. | Super high frequency band |
| C. | Ultra & Super high frequency band |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
Ionospheric communication can take place in |
| A. | High frequency band |
| B. | Very high frequency band |
| C. | Ultra high frequency band |
| D. | Super high frequency band |
| Answer» B. Very high frequency band | |
| 5. |
The auto-correlation of white noise is |
| A. | A delta function |
| B. | A constant |
| C. | Gaussian |
| D. | None of the mentioned |
| Answer» B. A constant | |
| 6. |
IONOSPHERIC_COMMUNICATION_CAN_TAKE_PLACE_IN?$ |
| A. | High frequency band |
| B. | Very high frequency band |
| C. | Ultra high frequency band |
| D. | Super high frequency band |
| Answer» B. Very high frequency band | |
| 7. |
The weighing matrix is$ |
| A. | Positive quantity |
| B. | Inverse of covariance matrix of the input vector |
| C. | Positive quantity & Inverse of a covariance matrix of the input vector |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
Satellite_communication_takes_place_in$ |
| A. | Ultra high frequency band |
| B. | Super high frequency band |
| C. | Ultra & Super high frequency band |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 9. |
Voltage generated by lightning is an example for |
| A. | Energy signal |
| B. | Power signal |
| C. | Energy & Power signal |
| D. | None of the mentioned |
| Answer» B. Power signal | |
| 10. |
Which has minimum power loss during transmission? |
| A. | Twisted Copper cable at 1KHz |
| B. | Optical fiber |
| C. | Twisted copper cable at 100KHz |
| D. | Wave guide |
| Answer» B. Optical fiber | |
| 11. |
Possible timing error detection methods are |
| A. | Early late |
| B. | Zero crossing |
| C. | Early late & Zero crossing |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
Two clock with rates T1 and T2 are incommensurate if its ratio is |
| A. | Rational |
| B. | Irrational |
| C. | Equal |
| D. | None of the mentioned |
| Answer» C. Equal | |
| 13. |
Non_uniform_tree_______bit_rate. |
| A. | Increases |
| B. | Decreases |
| C. | Does not affect |
| D. | None of the mentioned |
| Answer» B. Decreases | |
| 14. |
The auto-correlation of white noise i? |
| A. | A delta function |
| B. | A constant |
| C. | Gaussian |
| D. | None of the mentioned |
| Answer» B. A constant | |
| 15. |
The line code has a zero dc component for pulse transmission of random binary data is |
| A. | NRZ |
| B. | RZ |
| C. | Alternate mark inversion |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 16. |
A rectangular pulse of duration T is applied to a matched filter. The output of the filter is a |
| A. | Rectangular pulse of duration T |
| B. | Rectangular pulse of duration 2T |
| C. | Triangular pulse |
| D. | Sine function |
| Answer» D. Sine function | |
| 17. |
In a communication system, a process in which statistical averages and time averages are equal is called as |
| A. | Stationary |
| B. | Ergodic |
| C. | Gaussian |
| D. | Poisson |
| Answer» C. Gaussian | |
| 18. |
The capacity of a channel is given by |
| A. | Number of digits used in coding |
| B. | Volume of information it can take |
| C. | Maximum rate of information transmitted |
| D. | Bandwidth requires information |
| Answer» D. Bandwidth requires information | |
| 19. |
For a periodic function, the spectral density and auto correlation functions form |
| A. | Fourier transform pair |
| B. | Laplace transform pair |
| C. | Hilbert transform pair |
| D. | Z transform pair |
| Answer» B. Laplace transform pair | |
| 20. |
The power spectral density function of the stochastic process is |
| A. | Real |
| B. | Odd |
| C. | Real & odd |
| D. | None of the mentioned |
| Answer» B. Odd | |
| 21. |
A stationary stochastic process has |
| A. | Finite energy signal |
| B. | Infinite zero signal |
| C. | Zero energy signal |
| D. | None of the mentioned |
| Answer» C. Zero energy signal | |