MCQOPTIONS
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MCQOPTIONS
This section includes 271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics and Telecommunication Engineering [ENT knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Which thing is more dominant in making a fiber function as bidirectional optical amplifier? |
| A. | core material |
| B. | pump source |
| C. | cladding material |
| D. | diameter of fiber |
| Answer» C. cladding material | |
| 202. |
Linear scattering effects are _______ in nature. |
| A. | elastic |
| B. | non-elastic |
| C. | mechanical |
| D. | electrical |
| Answer» B. non-elastic | |
| 203. |
Nonlinear effects which are defined by the intensity – dependent refractive index of the fiber are called as |
| A. | scattering effects |
| B. | kerr effects |
| C. | raman effects |
| D. | tomlinson effects |
| Answer» C. raman effects | |
| 204. |
Self-phase modulation causes modifications to the pulse spectrum. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 205. |
Self-phase modulation can be used for |
| A. | enhancing the core diameter |
| B. | wavelength shifting |
| C. | decreasing the attenuation |
| D. | reducing the losses in the fiber |
| Answer» C. decreasing the attenuation | |
| 206. |
The beating between light at different frequencies or wavelengths in multichannel fiber transmission causes |
| A. | attenuation |
| B. | amplitude modulation of channels |
| C. | phase modulation of channels |
| D. | loss in transmission |
| Answer» D. loss in transmission | |
| 207. |
Which materials are unsuitable for the fabrication of graded index fiber? |
| A. | glass-like-materials |
| B. | mono-crystalline structures |
| C. | amorphous material |
| D. | silica based material |
| Answer» C. amorphous material | |
| 208. |
What is the first stage in liquid-phase-technique? |
| A. | preparation of ultra-pure material powders |
| B. | melting of materials |
| C. | decomposition |
| D. | crystallization |
| Answer» B. melting of materials | |
| 209. |
How many different categories are available for the methods of preparing optical glasses? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 210. |
What is a fundamental necessity in the fabrication of fibers for light transmission? |
| A. | same refractive index for both core and cladding. |
| B. | pump source |
| C. | material composition of fiber |
| D. | variation of refractive index inside the optical fiber |
| Answer» E. | |
| 211. |
Which of the following is not a technique for fabrication of glass fibers? |
| A. | vapor phase oxidation method |
| B. | direct melt method |
| C. | lave ring method |
| D. | chemical vapor deposition technique |
| Answer» D. chemical vapor deposition technique | |
| 212. |
Which processes are involved in the purification stage in liquid-phase-technique? |
| A. | filtration, co-precipitation, re-crystallization |
| B. | decomposition, filtration, drying |
| C. | doping, drying, decomposition |
| D. | filtration, drying, doping |
| Answer» B. decomposition, filtration, drying | |
| 213. |
At what temperature range, does the melting of multi components glass systems takes place? |
| A. | 100-300 degree celsius |
| B. | 600-800 degree celsius |
| C. | 900-1300 degree celsius |
| D. | 1500-1800 degree celsius |
| Answer» D. 1500-1800 degree celsius | |
| 214. |
The minute perturbations and impurities in the fiber drawing process using preform technique can result in very high losses of |
| A. | between 500 and 1000 db/km |
| B. | between 100 and 300 db/km |
| C. | between 1200 and 1600 db/km |
| D. | more than 2000 db/km |
| Answer» B. between 100 and 300 db/km | |
| 215. |
The liquid-phase melting technique is used for the production of fibers |
| A. | with a core diameter of 50μm. |
| B. | with a core diameter less than 100μm. |
| C. | with a core diameter more than 200μm. |
| D. | with a core diameter of 100μm. |
| Answer» D. with a core diameter of 100μm. | |
| 216. |
Which of the following materials is not used as a starting material in vapor-phase deposition technique? |
| A. | sicl4 |
| B. | gecl4 |
| C. | o2 |
| D. | b2o3 |
| Answer» E. | |
| 217. |
_____________ technique is method of preparing extremely pure optical glasses. |
| A. | liquid phase (melting) |
| B. | radio frequency induction |
| C. | optical attenuation |
| D. | vapor phase deposition (vp |
| Answer» E. | |
| 218. |
How many types of vapor-phase deposition techniques are present? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 219. |
P2O5Â is used as a _____________ |
| A. | dopant |
| B. | starting material |
| C. | cladding glass |
| D. | core glass |
| Answer» B. starting material | |
| 220. |
___________ uses flame hydrolysis stems from work on soot processes which were used to prepare the fiber with losses below 20 dB/km. |
| A. | outside vapor phase oxidation |
| B. | chemical vapor deposition |
| C. | liquid phase melting |
| D. | crystallization |
| Answer» B. chemical vapor deposition | |
| 221. |
Complete the given reaction |
| A. | 2hcl |
| B. | 4hcl |
| C. | 2cl2 |
| D. | 4cl2 |
| Answer» C. 2cl2 | |
| 222. |
In modified chemical vapor deposition, vapor phase reactant such as _________ pass through a hot zone. |
| A. | halide and oxygen |
| B. | halide and hydrogen |
| C. | halide and silica |
| D. | hydroxides and oxygen |
| Answer» B. halide and hydrogen | |
| 223. |
_________ is the stimulation of oxide formation by means of non-isothermal plasma maintained at low pressure in a microwave cavity surrounding the tube. |
| A. | outside vapor phase oxidation (ovpo) |
| B. | vapor axial deposition (vad) |
| C. | modified chemical vapor deposition (mcvd) |
| D. | plasma-activated chemical vapor deposition (pcv |
| Answer» E. | |
| 224. |
Only graded index fibers are made with the help of vapor-phase deposition techniques. State whether true or false. |
| A. | true |
| B. | false |
| Answer» C. | |
| 225. |
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» B. false | |
| 226. |
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» B. 100 to 300 nm | |
| 227. |
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» C. no impurity | |
| 228. |
. 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» D. 1.6 to 60 db km-1at wavelength 0.90μm | |
| 229. |
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» C. standard multimode fibers | |
| 230. |
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» C. low minimized fibers | |
| 231. |
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» B. multimode step fibers | |
| 232. |
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» C. core cladding ratio of the fiber | |
| 233. |
Optical fibers for communication use are mostly fabricated from |
| A. | plastic |
| B. | silica or multicomponent glass |
| C. | ceramics |
| D. | copper |
| Answer» C. ceramics | |
| 234. |
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» B. 6.32*109nm-1 | |
| 235. |
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» B. false | |
| 236. |
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» D. gamma statistics | |
| 237. |
. ____________ results from small lateral forces exerted on the fiber during the cabling process. |
| A. | attenuation |
| B. | micro-bending |
| C. | dispersion |
| D. | stimulated emission |
| Answer» C. dispersion | |
| 238. |
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» B. rough edges of the fiber | |
| 239. |
How many forms of modal power distribution are considered? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 240. |
What does micro-bending losses depend on? |
| A. | core material |
| B. | refractive index |
| C. | diameter |
| D. | mode and wavelength |
| Answer» E. | |
| 241. |
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» C. core of the fiber | |
| 242. |
The radiation-induced attenuation can be reduced through photo-bleaching. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 243. |
__________ can induce a considerable amount of attenuation in optical fibers. |
| A. | micro-bending |
| B. | dispersion |
| C. | diffusion of hydrogen |
| D. | radiation exposure |
| Answer» E. | |
| 244. |
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» C. | |
| 245. |
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» D. 0 db/km to5 db/km | |
| 246. |
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» D. 0.160% | |
| 247. |
How many categories exists in case of cable design? |
| A. | two |
| B. | three |
| C. | one |
| D. | four |
| Answer» C. one | |
| 248. |
How many types of buffer jackets are used in fiber buffering? |
| A. | three |
| B. | one |
| C. | two |
| D. | four |
| Answer» B. one | |
| 249. |
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» B. false | |
| 250. |
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» E. | |