You dont have javascript enabled! Please enable it! MCQ in Fiber Optics Communications Part 6 | ECE Board Exam

# MCQ in Fiber Optics Communications Part 6 | ECE Board Exam

This is the Multiples Choice Questions Part 6 of the Series in Fiber Optics Communications as one of the Communications Engineering topics. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize yourself with each and every question compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic Systems and Technologies, Communications Books, Journals, and other Communications References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Principles of Light Transmission
• MCQ in Types of Light Sources, Laser, LED
• MCQ in Light Detectors
• MCQ in Modulation and Waveform
• MCQ in System Design
• MCQ in General application
• MCQ in System Bandwidth
• MCQ in Splicing Techniques

#### Continue Practice Exam Test Questions Part 6 of the Series

Choose the letter of the best answer in each questions.

251. Type of lasers that use organic dyes enclosed in glass tube for an active medium.

A. liquid lasers

B. plasma lasers

C. neon lasers

D. ruby lasers

Solution:

252. A popular light wavelength fiber-optic cable is

A. 0.7 micrometer

B. 1.3 micrometer

C. 1.5 micrometer

D. 1.8 micrometer

Solution:

253. Type of lasers that use solid, cylindrical crystals such as ruby

A. solid lasers

B. ILD

C. gas lasers

D. liquid lasers

Solution:

254. Type of lasers that are made from semiconductor ph-junctions commonly called ILDs

A. semiconductor lasers

B. liquid lasers

C. plasma lasers

D. gas lasers

Solution:

255. Which of the following is not a common application of fiber-optic cable?

A. computer networks

B. long-distance telephone system

C. closed-circuit TV

D. consumer TV

Solution:

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

Solution:

257. Loss comparisons between fusion splices an mechanical splices

A. 1:10

B. 10:1

C. 20:1

D. 1:20

Solution:

258. The operation of a fiber-optic cable is based on the principle of

A. refraction

B. reflection

C. dispersion

D. absorption

Solution:

259. Which of the following is not a common type of fiber-optic cable?

A. single-mode step-index

D. multimode step-index

Solution:

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

Solution:

261. Which cable length has the highest attenuation?

A. 1 km

B. 2 km

C. 95 ft.

D. 500 ft.

Solution:

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

Solution:

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

Solution:

264. The core of a fiber-optic cable is made of

A. air

B. glass

C. diamond

D. quartz

Solution:

265. The core of fiber-optic cable is surrounded by

A. wire braid shield

B. Keviar

D. plastic insulation

Solution:

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

Solution:

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

Solution:

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.

Solution:

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

Solution:

270. Which of the following is not a part of the optical spectrum?

A. infrared

B. ultraviolet

C. visible color

D. x-rays

Solution:

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

Solution:

272. Single-mode step-index cable has a core diameter in the range of

A. 100 to 1000 micrometer

B. 50 to 100 micrometer

C. 2 to 15 micrometer

D. 5 to 20 micrometer

Solution:

273. Refraction is the

A. bending of light

B. reflection of light waves

C. distortion of light waves

D. diffusion of light waves

Solution:

274. Which of the following cables will have the highest launch power capability?

A. 50/125/0.2

B. 85/125/0.275

C. 62.5/125/0.275

D. 100/140/0.3

Solution:

275. Which type of fiber-optic cable is the most widely used?

A. single-mode step-index

B. multimode step-index

Solution:

276. The term power budgeting refers to

A. the cost of cable, connectors, equipment and installation

B. the loss of power due to defective components

C. the total power available minus the attenuation losses

D. the comparative costs of fiber and copper installations

Solution:

277. It refers to the abrupt of change in refractive index from core to clad

A. step index

D. half step index

Solution:

### Complete List of MCQ in Communications Engineering per topic

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