MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communication knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The techniques used to determine the refractive index profile can also be used to determine the core diameter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The shadow velocity is given by 0.4 μm μs-1 and shadow pulse of width 300 μs is registered at an instant by the photodetector. Determine the outer diameter of the optical fiber in μm. |
| A. | 100 μm |
| B. | 120 μm |
| C. | 140 μm |
| D. | 90 μm |
| Answer» C. 140 μm | |
| 3. |
The shadow method is used for measurement of the outer diameter of an optical fiber. The apparatus employs a rotating mirror with an angular velocity of 4 rad/s which is located at 10 cm from the photo detector. Compute the shadow velocity. |
| A. | 0.1 μm μs-1 |
| B. | 0.4 μm μs-1 |
| C. | 0.87 μm μs-1 |
| D. | 1 μm μs-1 |
| Answer» C. 0.87 μm μs-1 | |
| 4. |
The calculations of the numerical aperture from a refractive index data are less accurate for the graded index fibers than for step index fibers. |
| A. | False |
| B. | True |
| Answer» C. | |
| 5. |
THE_SHADOW_METHOD_IS_USED_FOR_MEASUREMENT_OF_THE_OUTER_DIAMETER_OF_AN_OPTICAL_FIBER._THE_APPARATUS_EMPLOYS_A_ROTATING_MIRROR_WITH_AN_ANGULAR_VELOCITY_OF_4_RAD/S_WHICH_IS_LOCATED_AT_10_CM_FROM_THE_PHOTO_DETECTOR_._COMPUTE_THE_SHADOW_VELOCITY.?$ |
| A. | 0.1 μm μs<sup>-1</sup> |
| B. | 0.4 μm μs<sup>-1</sup> |
| C. | 0.87 μm μs<sup>-1</sup> |
| D. | 1 μm μs<sup>-1</sup> |
| Answer» C. 0.87 ‚âà√≠¬¨‚à´m ‚âà√≠¬¨‚à´s<sup>-1</sup> | |
| 6. |
The techniques used to determine the refractive index profile can also be used to determine the core diameter. State whether the given statement is true or false.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The_shadow_velocity_is_given_by_0.4_μm_μs-1_and_shadow_pulse_of_width_300_μs_is_registered_at_an_instant_by_the_photodetector._Determine_the_outer_diameter_of_the_optical_fiber_in_μm.$# |
| A. | 100 μm |
| B. | 120 μm |
| C. | 140 μm |
| D. | 90 μm |
| Answer» C. 140 ‚âà√≠¬¨‚à´m | |
| 8. |
Which of the following is a non-contacting optical method of on-line diameter measurement? |
| A. | Brussels’s method |
| B. | Velocity differentiator method |
| C. | Photo detector method |
| D. | Image projection method |
| Answer» E. | |
| 9. |
What is the minimum value of accuracy in diameter is needed to avoid radiation losses in the fiber? |
| A. | 0.1% |
| B. | 0.2% |
| C. | 0.3% |
| D. | 0.03% |
| Answer» D. 0.03% | |
| 10. |
During the fiber drawing process, the fiber outer diameter is maintained constant to within ________ |
| A. | 2% |
| B. | 1% |
| C. | 5% |
| D. | 10% |
| Answer» C. 5% | |
| 11. |
The screen is positioned 10 cm from the fiber end face. When illuminated from a wide angled visible source the measured output pattern size is 6.2 cm. Calculate the approximate numerical aperture of the fiber. |
| A. | 0.21 |
| B. | 0.30 |
| C. | 0.9 |
| D. | 1.21 |
| Answer» C. 0.9 | |
| 12. |
Far field pattern measurements with regard to multimode fibers are dependent on the _____________ of the fiber. |
| A. | Amplitude |
| B. | Frequency |
| C. | Diameter |
| D. | Length |
| Answer» E. | |
| 13. |
The calculations of the numerical aperture from a refractive index data are less accurate for the graded index fibers than for step index fibers. State whether the given statement is true or false. |
| A. | False |
| B. | True |
| Answer» C. | |
| 14. |
The numerical aperture for a step index fiber is sine angle of the ____________ |
| A. | Efficient angle |
| B. | Aperture |
| C. | Acceptance angle |
| D. | Attenuation |
| Answer» D. Attenuation | |
| 15. |
The ____________ affects the light gathering capacity and the normalized frequency of the fiber. |
| A. | Numerical aperture |
| B. | Amplitude modulation |
| C. | Responsivity |
| D. | Quantum efficiency |
| Answer» B. Amplitude modulation | |