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QUESTION 11 What is true about delay skew? a. delay skew is only a problem with coaxial cables b. delay skew exists in UTP cables (e.g., Cat 5E) where each wire pair is twisted at different twist ratios c. delay skew only exists in unguided systems where path reflection causes signal copies to reach the receiver at different times d. delay skew is another term for signal propagation QUESTION 12 Coaxial conductors use unbalanced signals, which means that it is less capable than UTP balanced conductors with regards to data rate capacity and attenuation. True False QUESTION 13 What makes a fiber optic (FO) cable work? a. total internal reflection (TIR) is achieved provided the core and cladding have the same refractive indices b. FO light propagation only occurs when there is line-of-sight (LOS) between the source and detector c. light propagation occurs when the refractive index of the core differs from the refractive index of the cladding d. none of the above QUESTION 14 Select the correct statement(s) regarding SMF and MMF fiber optic cables. a. since MMF cables support multiple modes of light, it has greater capacity and supports greater distances compared to SMF b. Both MMF and SMF can be designed with step index or graded cores C. SMF propagates a single mode of light, thus reducing signal distortion d. all of the statements are correct