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Electronics & Communication System - Signal Systems

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43.

If x[n] is a right-sided sequence, and if the circle z = r0 is in the ROC, then

A.	the values of z for which z > r0 will also be in the ROC	B.	the values of z for which z < r0 will also be in the ROC
C.	both (A) & (B)	D.	none of these

44.

The ROC does not contain any

A.	poles	B.	1’s
C.	zeros	D.	none

45.

The ROC of z -transform of unit-step sequence u[n], is

A.	entire z -plane	B.	ǀz ǀ< 1
C.	ǀzǀ > 1	D.	none of the above

46.

The ROC of the unilateral z -transform of αn is

A.	ǀzǀ > ǀαǀ	B.	ǀzǀ < ǀαǀ
C.	ǀzǀ < 1	D.	ǀzǀ > 1

47.

Which of the following statement about ROC is not true ?

A.	ROC never lies exactly at the boundary of a circle	B.	ROC consists of a circle in the z -plane centred at the origin
C.	ROC of a right handed finite sequence is the entire z -plane except z = 0	D.	ROC contains both poles and zeroes

48.

The z -transform of unit step sequence is

A.	1	B.	1/z-1
C.	z/z-1	D.	0

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