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Electronics & Communication System - Signal Systems

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55.

The mapping z = esT from s -plane to z -plane, is

A.	one to one	B.	many to one
C.	one to many	D.	many to many

56.

The region of convergence of the z − transform of a unit step function is

A.	ǀzǀ > 1	B.	ǀzǀ < 1
C.	(Real part of z ) > 0	D.	(Real part of z ) < 0

57.

Which one of the following represents the impulse response of a system defined by H(z) = z−m ?

A.	u[n − m]	B.	δ[n − m]
C.	δ[m]	D.	δ[m − n]

58.

Convolution of two sequence x1[n] and x2[n] is represented as

A.	X1(z) * X2(z)	B.	X1(z)X2(z)
C.	X1(z) + X2(z)	D.	X1(z)/X2(z)

59.

Which one of the following digital filters does have a linear phase response ?

A.	y[n] + y[n − 1] = x[n] − x[n − 1]	B.	y[n] = 1/6(3x[n] + 2x[n − 1] + x[n − 2])
C.	y[n] = 1/6(x[n] + 2x[n − 1] + 3x[n − 2])	D.	y[n] = 1/4(x[n] + 2x[n − 1] + x[n − 2])

60.

The poles of a digital filter with linear phase response can lie

A.	only at z = 0	B.	only on the unit circle
C.	only inside the unit circle but not at z = 0	D.	on the left side of Real (z) = 0 line

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