MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If modulation index of an AM wave is increased from 1.5 to 2, then the transitted power ________ |
| A. | remains same |
| B. | increases by 20% |
| C. | increases by 41% |
| D. | increases by 50% |
| Answer» D. increases by 50% | |
| 2. |
________ microphones works on piezoelectric effect. |
| A. | Crystal |
| B. | Carbon |
| C. | Moving coil |
| D. | Condenser |
| Answer» B. Carbon | |
| 3. |
The voltage and electric current of a line are respectively 5kV and 1000μA. Find its power? |
| A. | 12W |
| B. | 13W |
| C. | 5W |
| D. | 10W |
| Answer» D. 10W | |
| 4. |
Inductance and capacitance of a line is 0.8 μH⁄m and 32 pF⁄m. Find Z0? |
| A. | 158 |
| B. | 166 |
| C. | 143 |
| D. | 127 |
| Answer» B. 166 | |
| 5. |
If the modulating frequency of a carrier wave varies between 700Hz and 7KHz, find it’s bandwidth? |
| A. | 10 KHz |
| B. | 23 KHz |
| C. | 17.3 KHz |
| D. | 12.6 KHz |
| Answer» E. | |
| 6. |
IF_MODULATION_INDEX_OF_AN_AM_WAVE_IS_INCREASED_FROM_1.5_TO_2,_THEN_THE_TRANSITTED_POWER_________?$ |
| A. | remains same |
| B. | increases by 20% |
| C. | increases by 41% |
| D. | increases by 50% |
| Answer» D. increases by 50% | |
| 7. |
________ microphones works on piezoelectric effect? |
| A. | Crystal |
| B. | Carbon |
| C. | Moving coil |
| D. | Condenser |
| Answer» B. Carbon | |
| 8. |
The voltage and electric current of a line are respectively 5kV and 1000μA. Find its power?$ |
| A. | 12W |
| B. | 13W |
| C. | 5W |
| D. | 10W |
| Answer» D. 10W | |
| 9. |
If average power of a transmitter is 4kW and maximum power is 20000KW. What is its duty cycle? |
| A. | 2 x 10<sup>-3</sup> |
| B. | 2 x 10<sup>-4</sup> |
| C. | 3 x 10<sup>-3</sup> |
| D. | 0.05 |
| Answer» C. 3 x 10<sup>-3</sup> | |
| 10. |
A 1000 KHz carrier is modulated with 300 Hz, 8000 Hz and 2 KHz waves. Determine the frequencies whose chances of occurring in output is least? |
| A. | 1000 KHz |
| B. | 1002 KHz |
| C. | 998 KHz |
| D. | 999.2 KHz |
| Answer» B. 1002 KHz | |
| 11. |
Find VSWR of a line having maximum and minimum value equals to 120mV and 40mV respectively? |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» B. 2 | |
| 12. |
Inductance and capacitance of a line is 0.8 μH⁄m and 32 pF⁄m. Find Z0 )?$ |
| A. | 158 |
| B. | 166 |
| C. | 143 |
| D. | 127 |
| Answer» B. 166 | |
| 13. |
A 400W carrier wave is modulated to a depth of 65%. Find the total power of modulated wave? |
| A. | 512.5W |
| B. | 493W |
| C. | 484.5W |
| D. | 609.6W |
| Answer» D. 609.6W | |
| 14. |
If the modulating frequency of a carrier wave varies between 700Hz and 7KHz, find it’s bandwidth? |
| A. | 10 KHz |
| B. | 23 KHz |
| C. | 17.3 KHz |
| D. | 12.6 KHz |
| Answer» E. | |