McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electronics and Telecommunication Engineering [ENTC] .
| 151. |
Modified Chemical Vapor Deposition (MCVD) process is also called as an inside vapor phase oxidation (IVPD) technique. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 152. |
Multimode step index fiber has |
| A. | large core diameter & large numerical aperture |
| B. | large core diameter and small numerical aperture |
| C. | small core diameter and large numerical aperture |
| D. | small core diameter & small numerical aperture |
| Answer» A. large core diameter & large numerical aperture | |
| 153. |
. A typically structured glass multimode step index fiber shows as variation of attenuation in range of |
| A. | 1.2 to 90 db km-1at wavelength 0.69μm |
| B. | 3.2 to 30 db km-1at wavelength 0.59μm |
| C. | 2.6 to 50 db km-1at wavelength 0.85μm |
| D. | 1.6 to 60 db km-1at wavelength 0.90μm |
| Answer» C. 2.6 to 50 db km-1at wavelength 0.85μm | |
| 154. |
A multimode step index fiber has a large core diameter of range |
| A. | 100 to 300 μm |
| B. | 100 to 300 nm |
| C. | 200 to 500 μm |
| D. | 200 to 500 nm |
| Answer» A. 100 to 300 μm | |
| 155. |
Multimode step index fibers have a bandwidth of |
| A. | 2 to 30 mhz km |
| B. | 6 to 50 mhz km |
| C. | 10 to 40 mhz km |
| D. | 8 to 40 mhz km |
| Answer» B. 6 to 50 mhz km | |
| 156. |
Multimode graded index fibers are manufactured from materials with |
| A. | lower purity |
| B. | higher purity than multimode step index fibers. |
| C. | no impurity |
| D. | impurity as same as multimode step index fibers. |
| Answer» B. higher purity than multimode step index fibers. | |
| 157. |
The performance characteristics of multimode graded index fibers are |
| A. | better than multimode step index fibers. |
| B. | same as multimode step index fibers. |
| C. | lesser than multimode step index fibers |
| D. | negligible |
| Answer» A. better than multimode step index fibers. | |
| 158. |
Multimode graded index fibers have overall buffer jackets same as multimode step index fibers but have core diameters |
| A. | larger than multimode step index fibers. |
| B. | smaller than multimode step index fibers. |
| C. | same as that of multimode step index fibers. |
| D. | smaller than single mode step index fibers. |
| Answer» B. smaller than multimode step index fibers. | |
| 159. |
Multimode graded index fibers with wavelength of 0.85μm have numerical aperture of 0.29 have core/cladding diameter of |
| A. | 62.5 μm/125 μm |
| B. | 100μm/140 μm |
| C. | 85 μm/ 125 μm |
| D. | 50 μm/ 125μm |
| Answer» B. 100μm/140 μm | |
| 160. |
Multimode graded index fibers use incoherent source only. State whether the following statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 161. |
In single mode fibers, the most beneficial index profile is |
| A. | step index |
| B. | graded index |
| C. | step and graded index |
| D. | coaxial cable |
| Answer» B. graded index | |
| 162. |
The fibers mostly not used nowadays for optical fiber communication system are |
| A. | single mode fibers |
| B. | multimode step fibers |
| C. | coaxial cables |
| D. | multimode graded index fibers |
| Answer» A. single mode fibers | |
| 163. |
Single mode fibers allow single mode propagation; the cladding diameter must be at least |
| A. | twice the core diameter |
| B. | thrice the core diameter |
| C. | five times the core diameter |
| D. | ten times the core diameter |
| Answer» D. ten times the core diameter | |
| 164. |
A fiber which is referred as non-dispersive shifted fiber is |
| A. | coaxial cables |
| B. | standard single mode fibers |
| C. | standard multimode fibers |
| D. | non zero dispersion shifted fibers |
| Answer» B. standard single mode fibers | |
| 165. |
Standard single mode fibers (SSMF) are utilized mainly for operation in |
| A. | c-band |
| B. | l-band |
| C. | o-band |
| D. | c-band and l-band |
| Answer» C. o-band | |
| 166. |
Fiber mostly suited in single-wavelength transmission in O-band is |
| A. | low-water-peak non dispersion-shifted fibers |
| B. | standard single mode fibers |
| C. | low minimized fibers |
| D. | non-zero-dispersion-shifted fibers |
| Answer» B. standard single mode fibers | |
| 167. |
When optical fibers are to be installed in a working environment, the most important parameter to be considered is |
| A. | transmission property of the fiber |
| B. | mechanical property of the fiber |
| C. | core cladding ratio of the fiber |
| D. | numerical aperture of the fiber |
| Answer» B. mechanical property of the fiber | |
| 168. |
It is not important to cover these optical fibers required for transmission. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 169. |
Optical fibers for communication use are mostly fabricated from |
| A. | plastic |
| B. | silica or multicomponent glass |
| C. | ceramics |
| D. | copper |
| Answer» B. silica or multicomponent glass | |
| 170. |
An Si-O bond with a Young’s modulus of 9*1010Nm-1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber. |
| A. | 4.32*109nm-1 |
| B. | 6.32*109nm-1 |
| C. | 5.2*109nm-1 |
| D. | 3*109nm-1 |
| Answer» A. 4.32*109nm-1 | |
| 171. |
Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.52*1010Nm-1 and Young’s modulus of 9 *109Nm-1. |
| A. | 3.1 % |
| B. | 2.8 % |
| C. | 4.5 % |
| D. | 3.9 % |
| Answer» D. 3.9 % | |
| 172. |
Stress corrosion must be considered while designing and testing optical fiber cables. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 173. |
Which statistics are used for calculations of strengths of optical fibers? |
| A. | edwin statistics |
| B. | newton statistics |
| C. | wei-bull statistics |
| D. | gamma statistics |
| Answer» C. wei-bull statistics | |
| 174. |
What does n denotes in the equation given below, if vc is the crack velocity; A is the constant for the fiber material and KI is the strength intensity factor? |
| A. | refractive index |
| B. | stress corrosion susceptibility |
| C. | strain |
| D. | young’s modulus |
| Answer» B. stress corrosion susceptibility | |
| 175. |
Optical fibers for communication use are mostly fabricated from |
| A. | plastic |
| B. | silica or multicomponent glass |
| C. | ceramics |
| D. | copper |
| Answer» B. silica or multicomponent glass | |
| 176. |
An Si-O bond with a Young’s modulus of 9*1010Nm-1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber. |
| A. | 4.32*109nm-1 |
| B. | 6.32*109nm-1 |
| C. | 5.2*109nm-1 |
| D. | 3*109nm-1 |
| Answer» A. 4.32*109nm-1 | |
| 177. |
Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.52*1010Nm-1 and Young’s modulus of 9 *109Nm-1. |
| A. | 3.1 % |
| B. | 2.8 % |
| C. | 4.5 % |
| D. | 3.9 % |
| Answer» D. 3.9 % | |
| 178. |
Stress corrosion must be considered while designing and testing optical fiber cables. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 179. |
Which statistics are used for calculations of strengths of optical fibers? |
| A. | edwin statistics |
| B. | newton statistics |
| C. | wei-bull statistics |
| D. | gamma statistics |
| Answer» C. wei-bull statistics | |
| 180. |
. ____________ results from small lateral forces exerted on the fiber during the cabling process. |
| A. | attenuation |
| B. | micro-bending |
| C. | dispersion |
| D. | stimulated emission |
| Answer» B. micro-bending | |
| 181. |
Microscopic meandering of the fiber core axis that is micro-bending is caused due to |
| A. | environmental effects |
| B. | rough edges of the fiber |
| C. | large diameter of core |
| D. | polarization |
| Answer» A. environmental effects | |
| 182. |
How many forms of modal power distribution are considered? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» B. two | |
| 183. |
What does micro-bending losses depend on? |
| A. | core material |
| B. | refractive index |
| C. | diameter |
| D. | mode and wavelength |
| Answer» D. mode and wavelength | |
| 184. |
The fiber should be________________ to avoid deterioration of the optical transmission characteristics resulting from mode-coupling-induced micro-bending. |
| A. | free from irregular external pressure |
| B. | coupled with plastic |
| C. | large in diameter |
| D. | smooth and in a steady state |
| Answer» A. free from irregular external pressure | |
| 185. |
The diffusion of hydrogen into optical fiber affects the ______________ |
| A. | transmission of optical light in the fiber |
| B. | spectral attenuation characteristics of the fiber |
| C. | core of the fiber |
| D. | cladding of the fiber |
| Answer» B. spectral attenuation characteristics of the fiber | |
| 186. |
__________ can induce a considerable amount of attenuation in optical fibers. |
| A. | micro-bending |
| B. | dispersion |
| C. | diffusion of hydrogen |
| D. | radiation exposure |
| Answer» D. radiation exposure | |
| 187. |
The radiation-induced attenuation can be reduced through photo-bleaching. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 188. |
The losses due to hydrogen absorption and reaction with fiber deposits can be temporary. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 189. |
The losses caused due to hydrogen absorption mechanisms are in the range of |
| A. | 20 db/km to25 db/km |
| B. | 10 db/km to15 db/km |
| C. | 25 db/km to50 db/km |
| D. | 0 db/km to5 db/km |
| Answer» C. 25 db/km to50 db/km | |
| 190. |
The cable must be designed such that the strain on the fiber in the cable does not exceed__________ |
| A. | 0.002% |
| B. | 0.01% |
| C. | 0.2% |
| D. | 0.160% |
| Answer» C. 0.2% | |
| 191. |
How many categories exists in case of cable design? |
| A. | two |
| B. | three |
| C. | one |
| D. | four |
| Answer» B. three | |
| 192. |
How many types of buffer jackets are used in fiber buffering? |
| A. | three |
| B. | one |
| C. | two |
| D. | four |
| Answer» A. three | |
| 193. |
Loose tube buffer jackets exhibits a low resistance to movement of the fiber. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 194. |
An inclusion of one or more structural members in an optical fiber so as to serve as a cable core foundation around which the buffer fibers may be wrapped is called _____________ |
| A. | attenuation |
| B. | splicing |
| C. | buffering |
| D. | stranding |
| Answer» D. stranding | |
| 195. |
Which of the following is not a strength member used in optical cable? |
| A. | steel wire |
| B. | germanium |
| C. | aramid yarns |
| D. | glass elements |
| Answer» B. germanium | |
| 196. |
When the stranding approach consists of individual elements (e.g. single-fiber or multi fiber loose tube buffer) than the cable is termed as |
| A. | optical unit cable |
| B. | coaxial cable |
| C. | layer cable |
| D. | bare glass cable |
| Answer» C. layer cable | |
| 197. |
The primary function of the structural member is load bearing. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 198. |
What is the Young’s modulus of Kevlar, an aromatic polyester? |
| A. | 9 ×1010nm-2 |
| B. | 10 ×1010nm-2 |
| C. | 12 ×1010nm-2 |
| D. | 13 ×1010nm-2 |
| Answer» D. 13 ×1010nm-2 | |
| 199. |
The cable is normally covered with an outer plastic sheath to reduce _______________ |
| A. | abrasion |
| B. | armor |
| C. | friction |
| D. | dispersion |
| Answer» A. abrasion | |
| 200. |
A measure of amount of optical fiber emitted from source that can be coupled into a fiber is termed as |
| A. | radiance |
| B. | angular power distribution |
| C. | coupling efficiency |
| D. | power-launching |
| Answer» C. coupling efficiency | |
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