Electronics & Communication System - Signal Systems

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37.

Which statement about ROC is not true                        
A. ROC does not contain any poles B. ROC consists of circle in the z-plane centered at the origin
C. ROC is a ring or disc in z-plane D. ROC contains both poles and zeros



38.

Z[u(-n)] is                        
A. #NAME? B. 1
C. 1/z-1 D. 1/1-z



39.

The z -transform is used to analyze                        
A. discrete time signals and system B. continuous time signals and system
C. both (A) and (B) D. none




40.

For a signal x[n], its unilateral z -transform is equivalent to the bilateral z -transform of                        
A. x[n]r[n] B. x[n]δ[n]
C. x[n]u[n] D. none of these



41.

The ROC of z -transform X(z) is defined as the range of values of z for which X(z)                        
A. zero B. diverges
C. converges D. none



42.

In the z -plane the ROC of z -transform X(z) consists of a                        
A. strip B. parabola
C. rectangle D. ring



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