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Electrical Engineering

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Feb 20, 2024

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1. Unlike coaxial cables and copper wires, optical fibers are immune to: effects of IR interference. electromagnetic interference.*******correct high-frequency transmission. signal losses. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::; 2.When the axes of two connected fibers are no longer parallel, the two connected fibers are in what kind of misalignment? Axial Lateral*****correct Angular Longitudinal ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 2. Which Of the following is NOT true regarding mode field diameter? A change in the mode field diameter results in a change in signal velocity.***Correct A change in the mode field diameter results in a change average dispersion index. The mode field diameter does not change with wavelength. The total mode field diameter changes with the wavelength. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 4.Which one of the following is NOT affected by surplus fiber (backlashes and tails)? Optical wavelengths carried on the fiber The Fiber Bill of Materials*** The optical loss budget The optical input power to the node :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 5.Which of the following results in an improvement in the Bit Error Ratio? Higher SBS The use of optical couplers The transmitter and receiver are closer together****correct? Use of mechanical connectors instead of fusion splices
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 6. What is the accepted color order for the first six fibers in a fiber optic cable? Blue, Orange, Green, Brown, Slate, White*****correct Blue, Brown, Green, Orange, Slate, White Orange, Blue, White, Slate, Green, Brown Slate, White, Blue, Orange, Brown, Green ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 7. The ITU DWDM grid assigns the laser output wavelengths to for channel spacing. O 0.8 nm; 200 GHz 0 0.7 nm; 100 GHz 0 0.7 nm; 200 GHz 0 0.8 nm; 100 GHz***correct ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 8. Which of the following is NOT a component of a GPON network? Optical Line Terminal Optical Network Termination 1x32 splitter Multimedia Terminal Adaptor******Correct :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 9.Which is considered to be proper handling of fiber? correct page 182 Avoid high humidity Keep exposed fiber out of direct sunlight Remove the buffer tube with a razor blade Evaluate the surface prior to prepping the fiber*** correct ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 10. Use of a__________ to install a fiber optic cable in a sodded yard will likely result in the least visible damage to property. trenching machine frost chain
plowing machine******* correct chain saw :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 11. Shot noise is a contributor to the total carrier-to-noise ratio of an optical link. Shot noise is caused by the: random variations in laser output amplitude. double Rayleigh backscatter. statistical variation in arriving photon distribution.******Correct interferometric intensity variations. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 12. What is the term for the minimum distance after a reflection that the OTDR can accurately measure to a second reflection? dead zone*******correct Fresnel zone sweet zone terminal zone ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 13. When using the drive-off method of installing fiber optic cables, lashing occurs: while the cable is being paid out.*****correct every 500 feet. after the cable has been pulled out. while the strand is still on the ground. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 14. Relative intensity noise is caused by: random variations in laser output amplitude.*******correct double Rayleigh backscatter. the statistical variation in output current independent of the optical input. interferometric intensity variations. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
15.Cable TV microwave systems typically: provide over-the-horizon links. provide links exceeding 100 km. have links that require line—of—sight.****correct operate in multi-point to point mode. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 16.What spectrum analyzer resolution bandwidth (RBW) would be used to accurately measure the amplitude of a low frequency beat located approximately 15 kHz above an NTSC video 3 kHz . 30 kHz***correct 300 kHz It doesn't matter. A spectrum analyzer displays all frequencies. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 17.When fusion splicing optical fibers: cleave angle is relevant.*****correct it is acceptable to mate different core sizes. 0.25 dB is the target splice loss. downstream and upstream losses must be equal. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 18.What is the advantage of using a Mach-Zender type modulator compared to direct modulation? Reduce the effects of chirp*******corect Reduce the relative intensity noise Page 296 – both answers seems to be correct. Reduce the carrier-to-noise ratio Reduce the effects of common path distortion :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 19.A primary benefit of DWDM is that it is a cost effective way to: increase redundancy. extend the reach of a single headend. expand bandwidth.*****correct
isolate network failures. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 20.Which optical modulation scheme requires the least complicated process for converting optical signals to RF? AM***correct Digital FM Sonet ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 21.The ITU Grid specifies a channel center wavelength of 1514.10 nanometers for 198.00 THz. What does the ITU Grid specify for the channel center wavelength corresponding to 190.00 THz 1586.20nm ' 1577.86nm***correct 1569.59nm 1452.92nm ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::; 22.To ensure FCC compliance, frequency measurements should be made using: the warm-up window timeframe specified by the manufacturer. NIST traceable equipment.***correct NIST traceable signal level meter. NBS traceable equipment. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::; 23.What does a modern optical power meter do? Measures only the wavelength of light coming out of a transmitter or fiber Measures only the amount of electrical power needed to run the transmitter Measures only the amount of light coming out of a transmitter or fiber Measures the amount and wavelength of light coming out of a transmitter or fiber***correct ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 24.Which of the following will NOT increase the Bit Error Rate?
Bad Connectors Long Drops***correct Incorrect amplifier operating levels Damaged cable ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 25.As it relates to fiber optics, post-amplifier noise is noise generated by an amplifier on the electrical output of the: headend combiner. RF section in the optical node laser. photodetector. ***correct :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 26.Light that has been scattered due to Double Rayleigh backscatter and combined with the normally transmitted optical signal will effectively: improve the link's carrier-to-noise ratio. degrade the link's noise performance.***correct degrade the link's distortion levels. improve the link's carrier-to-intermodulation ratio ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 27. The type of optical network that varies the intensity of the laser output to correspond to amplitude variations of the RF input to the transmitter uses which type of modulation? FM Digital SONET AM ***correct ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 28.Precision power level measurements on microwave systems are made using a:
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