HIGHLIGHTED-Fiber-Optics-Communications.docx

A computer networks b long distance telephone system

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A. computer networks B. long-distance telephone system C. closed-circuit TV D. consumer TV 256. Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? A. less than B. greater than C. equal to D. zero 257. Loss comparisons between fusion splices an mechanical splices A. 1:10 B. 10:1 C. 20:1 D. 1:20 258. The operation of a fiber-optic cable is based on the principle of A. refraction B. reflection C. dispersion D. absorption 259. Which of the following is not a common type of fiber-optic cable? A. single-mode step-index B. multimode graded-index C. single-mode graded-index D. multimode step-index 260. Cable attenuation is usually expressed in terms of A. loss per foot B. dB/km C. intensity per mile D. voltage drop per inch 261. Which cable length has the highest attenuation? A. 1 km B. 2 km C. 95 ft. D. 500 ft. 262. The mechanical splice is best suited for A. quicker installation under ideal condition B. minimum attenuation losses C. field service conditions D. situations in which cost of equipment is not a factor 263. The upper pulse rate and information-carrying capacity of a cable is limited by A. pulse shortening B. attenuation C. light leakage D. modal dispersion 264. The core of a fiber-optic cable is made of A. air B. glass C. diamond D. quartz 265. The core of fiber-optic cable is surrounded by A. wire braid shield B. Keviar C. cladding D. plastic insulation 266. The speed of light in plastic compared to the speed of light in air is A. less B. more C. the same D. zero 267. Which of the following is not a major benefit of a fiber-optic cable? A. immunity from interference B. no electrical safety problems C. excellent data security D. lower cost 268. EMD is best described by which statement? A. 70 percent of the core diameter and 70% of the fiber NA should be filled with light. B. 70 percent of the fiber diameter and 70% of the cone of acceptance should be filled with light. C. 70 percent of input light should be measured at the output. D. 70 percent of the unwanted wavelengths should be attenuated by the fiber. 269. The main benefit of light wave communications over microwaves or any other communications media are A. lower cost B. better security C. wider bandwidth D. freedom from interface 270. Which of the following is not a part of the optical spectrum? A. infrared B. ultraviolet C. visible color D. x-rays 271. The wavelength of a visible extends from A. 0.8 to 1.6 um B. 400 to 750 nm C. 200 to 660 nm D. 700 to 1200 nm 272. Single-mode step-index cable has a core diameter in the range of A. 100 to 1000 micrometer
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B. 50 to 100 micrometer C. 2 to 15 micrometer D. 5 to 20 micrometer 273. Refraction is the A. bending of light B. reflection of light waves C. distortion of light waves D. diffusion of light waves 274. Which of the following cables will have the highest launch power capability?
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