MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a photodiode requires incident optical power of 0.70 A/W. Determine photocurrent. |
| A. | 1.482 |
| B. | 2.457 |
| C. | 4.124 |
| D. | 3.199 |
| Answer» C. 4.124 | |
| 2. |
Determine incident optical power on a photodiode if it has photocurrent of 2.1 A and responsivity of 0.55 A/W. |
| A. | 4.15 |
| B. | 1.75 |
| C. | 3.81 |
| D. | 8.47 |
| Answer» D. 8.47 | |
| 3. |
Determine Responsivity of photodiode having o/p power of 3.55 m and photo current of 2.9 m. |
| A. | 0.451 |
| B. | 0.367 |
| C. | 0.982 |
| D. | 0.816 |
| Answer» E. | |
| 4. |
Determine the energy of photons incident on a photodiode if it operates at a wavelength of 1.36 m. |
| A. | 1.22*10<sup>-34</sup>J |
| B. | 1.46*10<sup>-19</sup>J |
| C. | 6.45*10<sup>-34</sup>J |
| D. | 3.12*10<sup>9</sup>J |
| Answer» C. 6.45*10<sup>-34</sup>J | |
| 5. |
Determine wavelength at which photodiode is operating if energy of photons is 1.9*10-19J? |
| A. | 2.33 |
| B. | 1.48 |
| C. | 1.04 |
| D. | 3.91 |
| Answer» D. 3.91 | |
| 6. |
Determine wavelength of photodiode having quantum efficiency of 40% and Responsivity of 0.304 AW-1. |
| A. | 0.87 m |
| B. | 0.91 m |
| C. | 0.88 m |
| D. | 0.94 m |
| Answer» E. | |
| 7. |
The Responsivity of photodiode is 0.294 AW-1at wavelength of 0.90 m. Determine quantum efficiency. |
| A. | 0.405 |
| B. | 0.914 |
| C. | 0.654 |
| D. | 0.249 |
| Answer» B. 0.914 | |
| 8. |
The quantum efficiency of photodiode is 40% with wavelength of 0.90*10-6. Determine the responsivity of photodiodes. |
| A. | 0.20 |
| B. | 0.52 |
| C. | 0.29 |
| D. | 0.55 |
| Answer» D. 0.55 | |
| 9. |
A photodiode has quantum efficiency of 45% and incident photons are 3*1011. Determine electrons collected at terminals of device. |
| A. | 2.456*10<sup>9</sup> |
| B. | 1.35*10<sup>11</sup> |
| C. | 5.245*10<sup>-7</sup> |
| D. | 4.21*10<sup>-3</sup> |
| Answer» C. 5.245*10<sup>-7</sup> | |
| 10. |
Determine quantum efficiency if incident photons on photodiodes is 4*1011 and electrons collected at terminals is 1.5*1011? |
| A. | 50% |
| B. | 37.5% |
| C. | 25% |
| D. | 30% |
| Answer» C. 25% | |
| 11. |
Quantum efficiency is a function of photon wavelength. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
The long cutoff wavelength of GaAs is 0.923 m. Determine bandgap energy. |
| A. | 1.478*10<sup>-7</sup> |
| B. | 4.265*10<sup>-14</sup> |
| C. | 2.784*10<sup>-9</sup> |
| D. | 2.152*10<sup>-19</sup> |
| Answer» E. | |
| 13. |
GaAs has band gap energy of 1.93 eV at 300 K. Determine wavelength above which material will cease to operate. |
| A. | 2.431*10<sup>-5</sup> |
| B. | 6.424*10<sup>-7</sup> |
| C. | 6.023*10<sup>3</sup> |
| D. | 7.234*10<sup>-7</sup> |
| Answer» C. 6.023*10<sup>3</sup> | |
| 14. |
In photo detectors, energy of incident photons must be ________________ band gap energy. |
| A. | Lesser than |
| B. | Greater than |
| C. | Same as |
| D. | Negligible |
| Answer» C. Same as | |
| 15. |
The fraction of incident photons generated by photodiode of electrons generated collected at detector is known as ___________________ |
| A. | Quantum efficiency |
| B. | Absorption coefficient |
| C. | Responsivity |
| D. | Anger recombination |
| Answer» B. Absorption coefficient | |