Electronics & Communication System - Signal Systems

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49.

The ROC for the z -transform of the sequence x[n] = u[− n] is                        
A. ǀzǀ > 0 B. ǀzǀ < 1
C. ǀzǀ > 1 D. does not exist



50.

If the ROC of z -transform of x[n] is Rx then the ROC of z -transform of x[− n] is                        
A. Rx B. −Rx
C. 1/Rx D. none of these



51.

If X(z) = Z{x[n]} , then X(z) = Z{a−nx[n]} will be                        
A. X (az) B. X(z/a)
C. X(a/z) D. X(1/az)




52.

The choice of realization of structure depends on                        
A. computational complexity B. memory requirements
C. parallel processing and pipelining D. all the above



53.

Which of the following schemes of system realization uses separate delays for input and output samples ?                        
A. parallel form B. cascade form
C. direct form-I D. direct form-II



54.

The direct form-I and II structures of IIR system will be identical in                        
A. all pole system B. all zero system
C. both (A) and (B) D. first order and second order systems



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