1. The Fourier transform of product of two time functions [f_{1}(t)f_{2}(t)] is given by :

(a) [f_{1}(ω) + f_{2}(ω)]

(b) [f_{1}(ω) / f_{2}(ω)]

(c) [f_{1}(ω) * f_{2}(ω)]

(d) [f_{1}(ω) x f_{2}(ω)]

2. The magnitude spectrum of a Fourier transform of a real-valued time signal has _______ symmetry.

(a) no

(b) odd

(c) even

(d) conjugate

3. The trigonometric Fourier series of a periodic time function can have only ______ terms.

(a) sine

(b) cosine

(c) sine and cosine

(d) dc and cosine

4. In Fourier series expansion, A_{n }will zero for _______ function and will be zero for _______ function.

(a) odd, odd

(b) odd, even

(c) even, odd

(d) even, even

5. The inverse Fourier transform of product of two time functions [f_{1}(ω)f_{2}(ω)] is given by :

(a) [f_{1}(t) + f_{2}(t)]

(b) [f_{1}(t) * f_{2}(t)]

(c) [f_{1}(t) / f_{2}(t)]

(d) [f_{1}(t) x f_{2}(t)]