June 12, 2021

Z Transform – 1 MCQ’s

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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=esT?
a) Sampling Period
b) Time Period
c) Normal Period
d) Average Period

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