Free Printable DSP UNIT-2

1.

causal sequence is also known as

a)

anti causal

b)

right hand sequence

c)

left hand sequence

d)

two sided sequence

2.

Z transform is a mathematical tool which is used for analysis of

a)

linear time variant system

b)

linear time invariant system

c)

linear system

d)

non linear time invariant system

3.

modulas of z less than 1 is known as

a)

causal sequence

b)

anti causal sequence

c)

two sided sequence

4.

In which type of sequence the ROC will not converge at z=0 and z= infinity

a)

causal sequence

b)

non causal sequence

c)

anti causal sequence

d)

none

5.

In anticausal sequence the ROC will not converge at z=infinity because x(z) value should not be equal to

a)

zero

b)

one

c)

infinity

d)

both zero and one

6.

In partial fraction method if the given x(z) denominator is in equation format we have to change in to partial form by

a)

factorisation

b)

multiplication

c)

division

7.

modulas of z greater than 1 is known as

a)

causal sequence

b)

anti causal sequence

c)

non causal sequence

8.

In anticausal sequence the samples ranges from zero to _____ value

a)

positive value

b)

negative value

c)

both positive and negative

9.

The process of finding samples x(n) from the given x(z) and ROC is known as

a)

inverse z transform

b)

z transform

10.

Two sided sequence is also known as

a)

causal sequence

b)

left hand sequence

c)

non causal sequence

d)

anti causal sequence

11.

In right hand sequence the ROC will converge for all values of z expect z =

a)

infinity

b)

one

c)

zero

d)

both zero and infinity

12.

In long division method if the given ROC is causal we will arrange the z positive values in which order

a)

ascending

b)

descending

13.

given x(z) =

\frac{z}{z-a}

and ROC |z|>1 the sample x(n) will be

a)

$a^nu\left(n\right)$

b)

$-b^nu\left(-n-1\right)$

c)

$-a^nu\left(n\right)$

d)

none

14.

$Given\ x\left(n\right)=\ -b^nu\left(-n-1\right)\ find\ the\ x\left(z\right)\ and\ ROC$

a)

$X\left(Z\right)=\ \frac{Z}{Z-a}\ ,\ ROC\ \left|Z\right|>1$

b)

$X\left(Z\right)=\ \frac{Z}{Z-b},\ ROC\ \left|Z\right|<1$

c)

$X\left(Z\right)\ =\ \frac{Z}{Z-b},\ ROC\ \left|z\right|>1$

d)

$x\left(z\right)\ =\ \frac{z}{z+b},\ ROC\ \left|z\right|<1$

15.

What is the set of all values of z for which X(z) attains a finite value?

a)

Region of convergence

b)

Radius of divergence

c)

Feasible solution

d)

None of the mentioned

16.

What is the ROC of the z-transform of the signal x(n)= aⁿu(n)+bⁿu(-n-1)?

a)

|a|<|z|<|b|

b)

|a|>|z|>|b|

c)

|a|>|z|<|b|

d)

|a|<|z|>|b|

17.

The ROC of z-transform of any signal cannot contain poles.

a)

true

b)

false

18.

Find the Z-transform of u(-n).

a)

$\frac{1}{1-z}$

b)

$\frac{1}{1+z}$

c)

$\frac{z}{1-z}$

d)

$\frac{z}{1+z}$

19.

For a right hand sequence, the ROC is entire z-plane.

a)

true

b)

false

20.

x(n) = aⁿ u(n) and x(n) = -aⁿ u(-n-1) have the same X(Z) and ROC.

a)

true

b)

false

DSP UNIT-2

Total questions: 20

Worksheet time: 20mins

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