# Z Transform – 1 MCQ’s

This set of MATLAB Multiple Choice Questions & Answers (MCQs) focuses on “Z Transform – 1″.

1. What is the output of the following code?

syms n;ztrans(2^n,z)

a) z/(z-2)

b) z/(z+2)

c) z/(2-z)

d) z/(2+z)

2. What is the output of the following code?

ztrans(1,z)

a) 1/z-1

b) 1/z+1

c) z/(z-1)

d) z/(z+1)

3. What is the output of the following code?

>>syms s; >> ztrans('n',s)

a) s/(s-1)^{2}

b) ns/(s-1)^{2}

c) s/(ns-1)^{2}

d) Error

4. What is the output of the following code?advertisement

ztrans('[1 0 1 0 1]',z)

a) [ z/(z – 1), 0, z/(z – 1), 0, z/(z – 1)]

b) [ z/(z + 1), 0, z/(z – 1), 0, z/(z – 1)]

c) [ z/(z – 1), 0, z/(z – 1), 0, z/(z -+1)]

d) [ z/(z + 1), 0, z/(z – 1), 0, z/(z + 1)]

5. What is the output of the following code?

>> ztrans('n',s)

a) s/(s-1)^{2}

b) ns/(s-1)^{2}

c) Error

d) s/(s+1)^{2}

6. The R.O.C. of impulse function is _________

a) The entire z-plane

b) Interior to the unit circle |z|=1

c) Exterior to the unit circle |z|=1

d) Between the unit circle |z|=1 and |z|=∞

7. What is the output of the following code?

ztrans([1,2,3 4*z],z)

a) [ z/(z – 1), (2*z)/(z – 1), (3*z)/(z – 1), (4*z)/(z – 1)^{2}]

b) [ z/(z + 1), (2*z)/(z + 1), (3*z)/(z + 1), (4*z)/(z – 1)^{2}]

c) [ z/(z – 1), (2*z)/(z – 1), (3*z)/(z – 1), (4*z)/(z + 1)^{2}]

d) [ z/(z – 1), (2*z)/(z – 1), (3*z)/(z – 1) (4*z)/(z – 1)^{2}]

8. What is the output of the following code?

ztrans(exp(2*n),z)

a) z/(z – exp(2))

b) z/(z – exp(-2))

c) z/(z + exp(-2))

d) z/(z + exp(2))

9. The R.O.C. of a unit step function is __________

a) |z|>|1|

b) Entire z plane except z=0

c) Entire z plane except z=∞

d) Does not exist

10. The bilateral Z-transform ranges from ____________

a) -∞ to ∞

b) 0 to ∞

c) -∞ to 0

d) Does not exist

11. If σ<0, the point in the z plane lies __ of the circle |z|=1.

a) Interior

b) Exterior

c) On the circumference

d) Nowhere near

12. The Z-transform is only for discrete signals.

a) True

b) False

13. What is the relationship b/n laplace transform and z-transform of a function?

a) Impulse invariant transformation

b) z=e^{-sT}

c) s=jw

d) s=σ

14. The Z-transform doesn’t follow the linearity principle.

a) True

b) False

15. What is the T in the relation z=e^{sT}?

a) Sampling Period

b) Time Period

c) Normal Period

d) Average Period

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