Eta Fiber/ Fiber Optics Final Exam Test Bank Latest Real Exam 200 Questions And Correct Detailed Answers With Rationales |Agrade

ETA Fiber/ fiber optics FINAL EXAM TEST BANK LATEST REAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES |A GRADE What type of light is used in fiber optic transmission? - ANSWER- Infrared What are the 4 items are needed for a fiber optic system to work? - ANSWER- Transmitter Fiber cable Receiver Connectors 1 mw is the same as what in dBm? - ANSWER- 0 dBm How is power measured in fiber optics? - ANSWER- dBm What fiber optic wavelength has the lowest loss? - ANSWER- 1550 What wavelengths windows are used most for communications in optical fibers? - ANSWER- 850nm 1300nm 1550nm What year was fiber optic cable first used in commercial telephone systems in the U.S.? - ANSWER- 1977 What light source is used for single mode fiber? - ANSWER- Laser diode What two light sources are used with multimode fiber? - ANSWER- LED and VCSEL All wavelengths of light travel at the same speed? True or false - ANSWER- False Which type of fiber has the larger core size? Single mode or multimode - ANSWER- Multimode What is OSHA responsible for? - ANSWER- To enforce safety precautions What are the two ways to reduce modal dispersion? - ANSWER- Use graded index fiber. Shrink the core size. What happens to the wavelength in optical fiber when the number of modes increases? - ANSWER- The wavelength gets shorter Where does Fresnel reflection occur? - ANSWER- At the air gap Inter mechanical connection What is it called when light bends when moving between water and air? - ANSWER- refraction What is the refractive index of the core and cladding of MM optical fiber? - ANSWER- 1.42 is for cladding 1.457 is for the core Single mode systems usually operate at what three wavelengths? - ANSWER- 1310nm 1550nm 1625nm What two multimode wavelengths are the most commonly used? - ANSWER- 850nm 1300nm How is attenuation measured? - ANSWER- Decibels (dB) What is a "mode" in optical fiber? - ANSWER- A path that light can travel through What will happen to tensile strength of a fiber cable if it is bent more than recommended? - ANSWER- Macro bends the tensile strength decreases OM3 and OM4 multimode fibers are known as what type of fiber? - ANSWER- Laser optimized What are the two most common core and cladding sizes in multimode optical fiber? - ANSWER- 50/125nm and 62.5nm The buffer diameter for fiber used in tight buffered cables is what? - ANSWER- 900nm What jacket color does single mode fiber have? - ANSWER- Yellow Twelve colors comprise the fiber color code. What are they in order? - ANSWER- Blue Orange Green Brown Slate White Red Black Yellow Violet Rose Aqua OM1 and OM2 are known as what type of fibers? - ANSWER- Legacy system Why does Grades Index fiber use numerous concentric layers of glass? - ANSWER- To prevent modal dispersion What are the optical fibers cladding bonded to during the assembly process? - ANSWER- Ferrule A fiber optic cable that is "fire retardant and low smoke" is called what according to the NEC? - ANSWER- Plenum What type of fiber has an aqua jacket? - ANSWER- OM3 and OM4 Mm laser optimized multimode What does the gel in a loose tube fiber optic cable protect the optical fiber from if the jacket falls? - ANSWER- Moisture from outside environment What is "OFNR" - ANSWER- Optical fiber nonconductive riser The NEC considers cables that contain no conductive members what type of cables? - ANSWER- Non conductive What type of cable has optical fibers and current carrying electrical conductors in the same jacket? - ANSWER- Composite What is the name of the tight buffered cable used for indoor applications? - ANSWER- Distribution What is the last thing you do before you test a connection? - ANSWER- Clean it What material is used for precision fiber connector ferrules? - ANSWER- Ceramic and zirconia What pattern of polishing is used to finish a fiber connector end face with the hand polish technique? - ANSWER- Figure 8 An MPO connector is a recognized by ANSITA-568.3 standard? True or false - ANSWER- True