MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A 10 kW carrier is sinusoidally modulated by two carriers corresponding to a modulation index of 30% and 40% respectively. The total radiated power is |
| A. | 11.25 kW |
| B. | 12.5 kW |
| C. | 15 kW |
| D. | 17 kW |
| Answer» B. 12.5 kW | |
| 2. |
A carrier is simultaneously modulated by two sine waves with modulation indices of 0.4 and 0.3. The resultant modulation index will be |
| A. | 1.0 |
| B. | 0.7 |
| C. | 0.5 |
| D. | 0.35 |
| Answer» D. 0.35 | |
| 3. |
A 2 MHz carrier is amplitude modulated by a 500 Hz modulating signal to a depth of 70%. If the unmodulated carrier power is 2 kW, the power of the modulated signal is |
| A. | 2.23 kW |
| B. | 2.36 Kw |
| C. | 1.18 kW |
| D. | 1.26 kW |
| Answer» B. 2.36 Kw | |
| 4. |
The aerial current of an AM transmitter is 18 A when unmodulated but increases to 20 A when modulated. The modulation index is |
| A. | 0.68 |
| B. | 0.73 |
| C. | 0.89 |
| D. | 0.95 |
| Answer» B. 0.73 | |
| 5. |
An AM signal is represented by x(t) = (20 + 4sin(500 t)) cos(2 t x 105)V. What is the total sideband power? |
| A. | 4 W |
| B. | 8 W |
| C. | 16 W |
| D. | 2 W |
| Answer» B. 8 W | |
| 6. |
An AM signal is represented by x(t) = (20 + 4sin(500 t)) cos(2 t x 105)V. What is the total signal power? |
| A. | 208 W |
| B. | 204 W |
| C. | 408 W |
| D. | 416 W |
| Answer» C. 408 W | |
| 7. |
An AM signal is represented by x(t) = (20 + 4sin(500 t)) cos(2 t x 105)V. What is the modulation index? |
| A. | 20 |
| B. | 4 |
| C. | 0.2 |
| D. | 10 |
| Answer» D. 10 | |