MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 61 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Class B linear amplifiers have maximum power efficiency of |
| A. | 0.5 |
| B. | 0.75 |
| C. | 0.785 |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 52. |
In MPSK, R/W |
| A. | Increases with increase in M |
| B. | Increases with decrease in M |
| C. | Decreases with increase in M |
| D. | Is not dependent on M |
| Answer» B. Increases with decrease in M | |
| 53. |
If we correlate the received signal with both orthogonal function the inner product will be |
| A. | In phase |
| B. | Quadrature |
| C. | In phase and quadrature |
| D. | Unity |
| Answer» D. Unity | |
| 54. |
In double side band spectrum which side-band is called as inverted side-band? |
| A. | LSB |
| B. | USB |
| C. | LSB & USB |
| D. | None of the mentioned |
| Answer» B. USB | |
| 55. |
TDM is less immune to cross-talk in channel than FDM. |
| A. | True |
| B. | False |
| Answer» C. | |
| 56. |
The orbital period of communication satellites is _______ as that of earth's rotational period. |
| A. | Same |
| B. | Greater |
| C. | Lesser |
| D. | None of the mentioned |
| Answer» B. Greater | |
| 57. |
In polarization division technique ______ polarization is used. |
| A. | Orthogonal |
| B. | Non orthogonal |
| C. | Orthogonal & Non orthogonal |
| D. | None of the mentioned |
| Answer» B. Non orthogonal | |
| 58. |
Which modulation has lower side lobe levels? |
| A. | QPSK |
| B. | OQPSK |
| C. | BPSK |
| D. | MSK |
| Answer» E. | |
| 59. |
Which modulation scheme uses nonlinear transponders? |
| A. | MSK |
| B. | Offset QPSK |
| C. | MSK & Offset QPSK |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 60. |
Flat top sampling of low pass signals |
| A. | Gives rise to aperture effect |
| B. | Implies over sampling |
| C. | Leads to aliasing |
| D. | Introduces delay distortion |
| Answer» B. Implies over sampling | |
| 61. |
Modulation process includes |
| A. | Analog to digital conversion |
| B. | Digital to analog conversion |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |