Electronics & Communication System - Signal Systems

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25.

Fourier transform of a unit impulse function is                        
A. 1/jw B. w
C. 1 D. 1/w



26.

If the width τ of a pulse of height unity approaches infinity, then its Fourier transform is equal to                        
A. 1 B. πδ(w)
C. 2πδ(w) D. infinity



27.

The spectrum of a Gaussian signal is                        
A. Gaussian function B. rectangular function
C. triangular function D. sinc function




28.

The Fourier transform of x(-t) is                        
A. X(w) B. X(-w)
C. X(1/w) D. –X(w)



29.

Two sequences x1 (n) and x2 (n) are related by x2 (n) = x1 (- n). In the z- domain, their ROC’s are                        
A. The same B. Reciprocal of each other
C. Negative of each other D. Complements of each other



30.

A band pass signal extends from 1 KHz to 2 KHz. The minimum sampling frequency needed to retain all information in the sampled signal is                        
A. 1 KHz B. 2 KHz
C. 3 KHz D. 4 KHz



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