Online Questions and Answers Topic Outline
- MCQs in Principles of Light Transmission
- MCQs in Types of Light Sources, Laser, LED
- MCQs in Light Detectors
- MCQs in Modulation and Waveform
- MCQs in System Design
- MCQs in General application
- MCQs in System Bandwidth
- MCQs in Splicing Techniques
MCQs in Fiber Optics Communications Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part IV of the Series
151. A device that was constructed from mirrors and selenium detectors that transmitted sound waves over a beam of light.
- A. lightphone
- B. photophone
- C. cameraphone
- D. walletphone
152. Which fiber-optic system is better?
- A. 3 repeaters
- B. 8 repeaters
- C. 11 repeaters
- D. 20 repeaters
153. What is the frequency limit of a copper wire?
- A. approximately 0.5 MHz
- B. approximately 1.0 MHz
- C. approximately 40 GHz
- D. none of the above
154. They were granted patents for scanning and transmitting television images through uncoated fiber cables.
- A. Baird and Hansel
- B. Bockham and Kao
- C. Kapron and Keck
- D. Maiman and Schawlow
155. The product of the bit rate and distance of a fiber-optic system is 2 Gbits-km/s. What is the maximum rate at 5 km?
- A. 100 Mbits/s
- B. 200 Mbits/s
- C. 400 Mbits/s
- D. 1000 Gbits/s
156. Approximately what is the frequency limit of the optical fiber?
- A. 20 MHz
- B. 1 MHz
- C. 100 MHz
- D. 40 GHz
157. They experimented with light transmission cables through bundle of fibers and lead to the development of flexible fiberscope.
- A. Townes, Schawlow and Kao
- B. Maiman, Kao and Bockham
- C. Maurer, Kapron and Keck
- D. Van Heel, Hopkins and Kapany
158. Photodiodes operate properly with
- A. forward bias
- B. reverse bias
- C. neither forward nor reverse bias
- D. either forward or reverse bias
159. He coined the term “fiber optics” in 1956.
- A. Kapany
- B. Kao
- C. Bockham
- D. Keck
160. They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser).
- A. Theodore Maiman
- B. KC Kao and GA Bockham
- C. Charles Townes and Arthur Schawlow
- D. Kapron, Keck and Maurer
161. The scientist who built the first optical maser
- A. Charles Townes
- B. GA Bockham
- C. Theodore Maiman
- D. ACS Van Heel
162. A single fiber can handle as many voice channels as
- A. a pair of copper conductors
- B. a 1500-pair cable
- C. a 500-pair cable
- D. a 1000-pair cable
163. They proposed a new communication medium using cladded fiber cables.
- A. Kao and Bockham
- B. Maiman, Kao and Bockham
- C. Kapron, Keck and Maurer
- D. Maiman and Schawlow
164. An incident ray can be defined as
- A. a light ray reflected from a flat surface
- B. a light directed toward a surface
- C. a diffused light ray
- D. a light ray that happens periodically
165. Developed an optical fiber with losses less that 2 dB/km
- A. Kao and Bockham
- B. Maiman, Kao and Bockham
- C. Maiman and Schawlow
- D. Kapron, Keck and Maurer
166. The band of light frequencies that are too high to be seen by the human eye.
- A. Ultraviolet
- B. Visible light
- C. Infrared
- D. Yellow
167. Which of the following is the fastest light sensor?
- A. PIN photodiode
- B. Photovoltaic diode
- C. Photodiode
- D. Avalanche photodiode
168. Range of infrared
- A. 360 nm to 440 nm
- B. 670 nm to 10^3 nm
- C. 110 nm to 240 nm
- D. 770 nm to 10^6 nm
169. The term dispersion describes the process of
- A. separating light into its component frequencies
- B. reflecting light from a smooth surface
- C. the process by which light is absorbed by an uneven rough surface
- D. light scattering
170. The band of light frequencies to which human eye will respond
- A. Infrared
- B. Visible light
- C. Ultraviolet
- D. Cosmic ray
171. Laser light is very bright because it is
- A. pure
- B. white
- C. coherent
- D. monochromatic
172. Which of the following is the fastest light sensor?
- A. PIN photodiode
- B. Photovoltaic diode
- C. Photodiode
- D. Avalanche photodiode
173. Range of wavelength of visible light
- A. 670 nm to 10^3 nm
- B. 440 nm to 540 nm
- C. 110 nm to 240 nm
- D. 390 nm to 770 nm
174. The band of light frequencies that are too low to be seen by the human eye
- A. Infrared
- B. X-rays
- C. Visible
- D. Ultraviolet
175. Which of the following terms best describes the reason that light is refracted at different angles?
- A. Photon energy changes with wavelength
- B. Light is refracted as a function of surface smoothness
- C. The angle is determined partly by a and b
- D. The angle is determined by the index of the materials
176. Range of wavelengths of ultraviolet
- A. 670 nm to 10^3 nm
- B. 440 nm to 540 nm
- C. 110 nm to 240 nm
- D. 10 nm to 390 nm
177. Single frequency light is called
- A. pure
- B. intense
- C. coherent
- D. monochromatic
178. The coating in a fiber helps protect fiber from moisture, which reduces the possibility of the occurrence of a detrimental phenomenon called
- A. static fatigue
- B. mechanical fatigue
- C. stress fatigue
- D. coating fatigue
179. The term critical angle describes
- A. the point at which light is refracted
- B. the point at which light becomes invisible
- C. the point at which light has gone from the refractive mode to the reflective mode
- D. the point at which light has crossed the boundary layers from one index to another
180. The ratio of the speed of light in air to the speed of light in another substance is called
- A. speed factor
- B. index of reflection
- C. index of refraction
- D. speed gain
181. The three essential types of fiber commonly used today except:
- A. Plastic core and cladding
- B. Plastic core and glass cladding
- C. Glass core and glass cladding (SCS)
- D. Glass core and plastic cladding (PCS)
182. What phenomenon will result if the glass fiber is exposed to long periods of high humidity?
- A. stress fatigue
- B. core corrosion
- C. stress corrosion
- D. cladding corrosion
183. The law that states “When visible light of high frequency electromagnetic radiation illuminates a metallic surface, electrons are emitted” is known as ____________.
- A. Einstein law of photon
- B. Marconi’s law
- C. Maxwell’s law
- D. Plank’s law
184. Both LEDs and ILDs operate correctly with
- A. forward bias
- B. reverse bias
- C. neither forward nor reverse bias
- D. either forward or reverse bias
185. Any energy above the ground state is called ___________.
- A. normal state
- B. above-ground state
- C. excited state
- D. spontaneous state
186. The process of decaying from one energy level to another energy level is called __________.
- A. Spontaneous emission
- B. Excited emission
- C. Absorption
- D. Any of these
187. The process of moving from one energy level to another is called ____________.
- A. Spontaneous emission
- B. Excited emission
- C. Absorption
- D. Spontaneous decay
188. Most fiber optic light sources emit light in which spectrum?
- A. visible
- B. infrared
- C. ultraviolet
- D. X-ray
189. A packet of energy which is equal to the difference between the two energy levels.
- A. Photons
- B. Electronvolt
- C. Quantum
- D. Quanta
190. It is the science of measuring only light waves that are visible to the human eye.
- A. Radiometry
- B. Photometry
- C. Ophthalmology
- D. Optometry
191. The refractive index number is
- A. a number which compares the transparency of a material with that of air
- B. a number of assigned by the manufacturer to the fiber in question
- C. a number which determines the core diameter
- D. a term describing core elasticity
192. It is a science of measuring light throughout the entire electromagnetic spectrum
- A. Radiometry
- B. Photometry
- C. Ophthalmology
- D. Optometry
193. Which light emitter is preferred for high-speed data in a fiber-optic system?
- A. incandescent
- B. LED
- C. neon
- D. laser
194. Light intensity is generally described in terms of __________ and measured in _________.
- A. Luminous flux density; Lumens per unit area
- B. Luminous flux intensity; Lumens per unit area
- C. Luminous flux density; Lumens per unit volume
- D. Luminous flux intensity; Lumens per unit volume
195. In radiometric terms, it measures the rate at which electromagnetic waves transfer light energy
- A. Optical radiation
- B. Optical impedance
- C. Optical illusion
- D. Optical power
196. It is described as the flow of light energy past a given point in a specified time
- A. Optical radiation
- B. Optical impedance
- C. Optical illusion
- D. Optical power
197. The term single mode and multimode are best described as
- A. a number of fibers placed into fiber-optic cable
- B. the number of voice channels each fiber can support
- C. the number of wavelengths each fiber can support
- D. the index number
198. Optical power is sometimes called __________.
- A. Radiant emission
- B. Radiant power
- C. Radiant flux
- D. Radiant optics
199. In refraction that occurs in air/glass interfaces, among the visible light, which is bent the most?
- A. red
- B. violet
- C. yellow
- D. green
200. Fiber-optic cables with attenuation of 1.8, 3.4, 5.9 and 18 dB are linked together. The total loss is
- A. 7.5 dB
- B. 19.8 dB
- C. 29.1 dB
- D. 650 dB
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