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Electronics and Communication Communication Systems Difficulty: Medium

Gunn diode can replace reflex klystron in 1. Signal Generators 2. Frequency modulated power oscillators 3. Parametric amplifier pumps A finite duration discrete-time signal x(n) is obtained by sampling the continuous-time signal x(t) = cos(200πt) at sampling instant t = n/400, n = 0, 1, . . . , 7. The 8-point discrete Fourier transform (DFT) of x(n) is defined as $$X\left[ k \right] = \sum\limits_{n = 0}^7 {x\left[ n \right]{e^{\frac{{ - j\pi kn}}{4}}},\,k = 0,\,1,\,.....,\,7} $$ Which one of the following statements is true? The study of energy distribution across the frequency spectrum of a given electrical signal is done by a As the atoms of rare gases become larger, electronic polarizability Which of the following can work as error detecting devices? 1. A pair of potentiometers 2. A pair of synchros 3. A differential transformer 4. A Metadyne 5. A control transformer