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Electronics and Communication Network Theory And Analysis Difficulty: Medium

For a silica fiber the refractive index of core layer is 1.56 and that of cladding is 1.35. Calculate numerical aperture A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an ideal low-pass filter with cutoff frequency 800 Hz. The output signal has the frequency What is the modulation index of an FM signal having a carrier swing of 100 kHz and modulating frequency of 8 kHz? A delta-connected network with its Wye-equivalent is shown in the figure. The resistances R 1 , R 2 and R 3 (in ohms) are respectively A second order LTI system is described by the following state equations \[\frac{{\rm{d}}}{{{\rm{dt}}}}\] x 1 (t) - x 2 (t) = 0 \[\frac{{\rm{d}}}{{{\rm{dt}}}}\] x 2 (t) + 2x 1 (t) + 3x 2 (t) = r(t) where x 1 (t) and x 2 (t) are the two state variables and r(t) denotes the input. The output c(t) = x 1 (t). The system is