Q1. The discrete-time signal x (n) = (-1)^n is periodic with fundamental period ?
Q2. The Fourier transform (FT) of a function x (t) is X (f). The FT of dx(t )/ dt will be.
Q3. Inverse Fourier transform of u(w) is
Q4. If G(f) represents the Fourier Transform of a signal g (t) which is real and odd symmetric in time, then G (f) is
(A) complex.
(B) imaginary.
(C) real.
(D) real and non-negative.
Q5. The spectrum of x (n) extends from − wo to + wo , while that of h(n) extends from − 2w o to + 2 wo.
The spectrum of y(n) = h(n) *x(n) extends from
(A) − 4 wo to + 4w o
(B) − 3wo to + 3wo
(C) − 2 wo to + 2wo
(D) − wo to + wo
Q6. The signals x1(t ) and x2 (t) are both bandlimited to (− w1, +w1 ) and (− w2, +w2) respectively.
The Nyquist sampling rate for the signal x1(t) x2(t)will be
(A) 2w1 if w1 > w2; (B) 2w2 if w1 < w2 ; (C) 2(w1 + w2) ; (D) (w1 + w2)/2
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