Description : Type of bend that occurs as a result of differences in thermal contraction rates between the core and the cladding material. ∙ A. Macrobending ∙ B. Microbending ∙ C. Quad bending ∙ D. Constant-radius bending
Last Answer : B. Microbending
Description : It is a result of photons of light that are absorbed by the atoms of the glass core molecule
Last Answer : infrared absorption
Description : 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
Last Answer : stress corrosion
Description : As the core and cladding modes travel along the fiber, mode coupling occurs. What is mode coupling?
Last Answer : Mode coupling is the exchange of power between two modes.
Description : A modulation technique where data rates in excess of 56 kbps can be achieved over telephone circuits
Last Answer : Trellis Code Modulation
Description : Single-mode step-index cable has a core diameter in the range of
Last Answer : 2 to 15 micrometer
Description : It is the thermal noise power normalized to 1- Hz bandwidth:
Last Answer : noise power density
Description : ECE Board Exam March 1996 That dielectric material of an optical fiber surrounding the core A. Cladding B. Armor C. Shield D. Cover
Last Answer : A. Cladding
Description : In single mode operation, the value of the normalized frequency (V) should remain near the 2.405 level. If the value of V is less than 1, do single mode fibers carry a majority of the power in the core or cladding material?
Last Answer : Cladding material.
Description : Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium (A) Tin, nickel, iron and chromium (B) And graphite
Last Answer : (A) Tin, nickel, iron and chromium
Description : What phenomenon will result if the glass fiber is exposed to long periods of high humidity?
Description : The result whenever the sampling rate is less than twice the highest audio frequency.
Last Answer : alias
Description : What is the result if the input of ADC is changing while performing conversion? A
Last Answer : Aperture distortion
Description : When microwave energy is passed through a piece of ferrite in a magnetic field, another effect occurs. If the frequency of the microwave energy is much greater than the electron wobble frequency, the plane of polarization of the wavefront is rotated. This is known as
Last Answer : Faraday Rotation Effect
Description : The phase relationship between signaling elements for BPSK is the optimum signaling format and occurs only when two binary signal levels are allowed and when one signal is the exact negative of the other
Last Answer : Antipodal signaling
Description : Congestion in a network or internetwork occurs because routers and switches have _______
Last Answer : queues
Description : It is caused by valence electrons in the silica material from which the fiber are manufactured.
Last Answer : ultraviolet absorption
Description : It is caused by hydroxide ions in the material
Last Answer : ion resonance absorption
Description : The size, shape, and dielectric material of a waveguide must be constant throughout its length for energy to move from one end to the other without reflections. What could be the effect in any abrupt change in its size or shape?
Last Answer : Reflections.
Description : A type of index of an optical fiber that has no cladding and whose central core has a non-uniform refractive index. ∙ A. graded index ∙ B. multimode ∙ C. single mode ∙ D. step-index
Last Answer : ∙ A. graded index
Description : A type of index profile of an optical fiber that has a central core and outside cladding with a uniform refractive index ∙ A. multimode ∙ B. graded index ∙ C. step-index ∙ D. single mode
Last Answer : ∙ C. step-index
Description : The core of a fiber optic is surrounded by a. Wire braid shield b. Kevlar c. Cladding d. Plastic insulation
Last Answer : c. Cladding
Description : The inner portion of the fiber cable is called a. Cladding b. Coating c. Inner conductor d. Core
Last Answer : d. Core
Description : The core of an optical fiber has a a. Lower refracted index than air b. Lower refractive index than the cladding c. Higher refractive index than the cladding d. Similar refractive index with the cladding
Last Answer : c. Higher refractive index than the cladding
Description : The core of the optical fiber has ______. A. A medium index of refraction B. A lower index of refraction than the cladding C. A lower index of refraction than air D. A higher index of refraction than the cladding
Last Answer : D. A higher index of refraction than the cladding
Description : ______ cables arecomposed ofa glass or plastic inner core surrounded by cladding, allencasedin an outside jacket. A) Coaxial B) Fiber-optic C) Twisted-pair D) none of the above
Last Answer : Fiber-optic
Description : The core refractive index should be lesser than the cladding refractive index for a coaxial cable. State True/False a) True b) False
Last Answer : b) False
Description : The numerical aperture of a coaxial cable with core and cladding indices given by 2.33 and 1.4 respectively is a) 3.73 b) 0.83 c) 3.46 d) 1.86
Last Answer : d) 1.86
Description : ……cables are composed of a glass or plastic inner core surrounded by cladding,all encased in an outside jacket. a. Fiber-optic b. Coaxial c. Shield Twisted Pair d. Unshield Twisted-pair
Last Answer : a. Fiber-optic
Description : Give two reasons why optical fiber manufacturers depart from the traditional circular core and cladding, low-loss glass fiber design?
Last Answer : To increase performance and reduce cost
Description : Multimode step-index fibers have a core and cladding of constant refractive index n1 and n2, respectively. Which refractive index, the core or cladding, is lower?
Last Answer : Cladding.
Description : Explain the difference between multimode and single mode core-cladding concentricity errors.
Last Answer : Multimode core-cladding concentricity error is the distance between the core and cladding centers expressed as a percentage of core diameter while the single mode core-cladding concentricity error is just the distance between the core and cladding centers
Description : The core of fiber-optic cable is surrounded by ∙ A. wire braid shield ∙ B. Keviar ∙ C. cladding ∙ D. plastic insulation
Last Answer : ∙ C. cladding
Description : How many modes possible with a multimode step-index with a core diameter of 50 um, a core refractive index of 1.6, a cladding refractive index of 1.584, and a wavelength of 1300 nm. ∙ A. 456 ∙ B. 213 ∙ C. 145 ∙ D. 372
Last Answer : D. 372
Description : 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)
Last Answer : B. Plastic core and glass cladding
Description : ____ is applied to protect core and cladding of the fiber ∙ a. Insulation ∙ b. Fiber insulation ∙ c. Silica ∙ d. Polymer jacket
Last Answer : d. Polymer jacket
Description : Optical fibers for telecommunications are typically about _____ mils thick and consists of a glass core, a glass cladding of lower index of refraction, and a protective coating ∙ a. 5 ∙ b. 6 ∙ c. 7 ∙ d. 8
Last Answer : ∙ a. 5
Description : The core of a fiber optic is surrounded by ∙ a. Wire braid shield ∙ b. Kevlar ∙ c. Cladding ∙ d. Plastic insulation
Last Answer : ∙ c. Cladding
Description : The inner portion of the fiber cable is called ∙ a. Cladding ∙ b. Coating ∙ c. Inner conductor ∙ d. Core
Last Answer : ∙ d. Core
Description : The core of an optical fiber has a ∙ a. Lower refracted index than air ∙ b. Lower refractive index than the cladding ∙ c. Higher refractive index than the cladding ∙ d. Similar refractive index with the cladding
Description : Compared to the core, the index of refraction of the cladding must be: a. the same b. greater c. less d. doesn’t have an index of refraction
Last Answer : c. less
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : Which type of fiber-optic cable is the most widely used?
Last Answer : multimode step-index
Description : Which type of fiber-optic cable has the least modal dispersion?
Last Answer : single-mode step index
Description : With which emission type is the capture effect more pronounced?
Last Answer : FM
Description : What is the type of mastergroup used for low – capacity microwave systems?
Last Answer : L600
Description : Type of PCM which is designed to take advantage of the sample-to-sample redundancies in the typical speech waveform
Last Answer : Differential PCM
Description : ____ is a virtual-circuit wide-area network that was designed in response to demands for a new type of WAN in the late 1980s and early 1990s.
Last Answer : . Frame Relay
Description : A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts
Last Answer : C. Distortion of impression
Description : The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization ___
Last Answer : is horizontal