Electronics & Communication System - Signal Systems

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19.

The impulse response of a system is h(t) = at u(t). The condition for the system to be BIBO stable is                        
A. a is real and positive B. a is real and negative
C. | a| > 1 D. |a| <1



20.

Region of convergence of a causal LTI system                        
A. Is the entire s-plane B. Is the right-half of s-plane
C. Is the left-half of s-plane D. Does not exist



21.

The relation between a signum function and a unit step function is                        
A. 2u(t)-1 B. 2u(t)
C. u(t)-u(-t) D. u(t)-1




22.

In a set of signals, if no signal can be represented as a linear combination of the remaining signals, then such signals are                        
A. linearly independent B. linearly dependent
C. orthonormal D. orthogonal



23.

In the trigonometric Fourier series representation of a signal a0 is the                        
A. RMS value B. peak value
C. mean square value D. average value



24.

In the frequency spectrum of an aperiodic signal, the spacing among the components is                        
A. large B. small
C. infinity D. zero



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