Answer Happy

IRA#5_1. Given x(t)- 28(1-4)-8(t-3) and Fourier transform of x(t) is X(co), then X(0) is equal to (a) 0 (b) 1 (c) 2 (d) 3 (c) 4 Answer: IRA#5_2. Given that the Fourier transform of x(t) is X(co), if x(t)--2t for -1<t<+1 and x(1)-0 otherwise, then X(co) is a/an (a) complex-valued function of co with real and imaginary parts (b) real even function of co (c) real odd function of co (d) imaginary even function of co (e) imaginary odd function of co Answer: IRA#5_3. Given that X(co) is the Fourier transform of x(t) and X(co) = (1+j)e, the amplitude and phase spectra of x(t) are respectively (a) 1+j, -200 (b) 1+j, -j200 (c) √2, -200-π/4 (d) √2, -20+r/4 (e) √2, -j20 Answer:
TRANS 4. The following figure shows a system formed with two cascaded subsystems with impulse responses h.(t) and hut). Given that the Fourier transforms of h00 and bu() are respectively Hi(m)-d and H(o)-2e, the system overall frequency response in (a) e (b) 201 (c) 20 (d) e (e) 20 Answer: (a) 0 (b) 1 (c) 2 Answer: IRA#5 5. The signal x(t-5) is a rectangular pulse having an amplitude of 2 and a pulse width of 2 seconds. The amplitude of the spectrum of x(t) at frequency f-0 Hz is (d) 3 (e) 4 hi(t) ha(0