Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (EEE)- Electrical And Electronics Engineering 2020 December 4th Sem 77609 Signals And Systems Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (Electrical & Electronics ) (2018 Batch) (Sem.?4)
SIGNALS AND SYSTEMS
Subject Code : BTEE-404-18
M.Code : 77609
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
Write the mathematical and graphical representation of a unit step sequence.
2.
Determine the even and odd components of x(t) = cost + sint.
3.
What is Power Spectral Density?
4.
State the necessary and sufficient conditions for the existence of the Fourier series
representation for a signal.
5.
Define Sampling Theorem.
6.
What is meant by Difference Equation?
7.
Explain Ergodic process.
8.
Test the system y(t) = 7 x(t) + 5 for linearity.
9.
What is meant by Noise temperature?
10. How is the shot noise represented?
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SECTION-B
11. Define Signal. Discuss the classification of signals with suitable example.
12. Determine the Fourier Transform of the unit step function u (t).
13. Discuss the convolution integral representation of LTI system.
14. Discuss the properties of Fourier transform and prove at least four of them.
15. Derive an expression for noise in an envelope detector.
SECTION-C
16. What is DTFT? Discuss various properties of DTFT.
17. a) Calculate the Z- transform of : x(n) = anu(?n ?1).
b) Find the system function H(z) and unit sample response h(n) of the system whose
1
difference equation can be described by y(n)
2x(n), where y(n) and x(n) are
2 y(n 1)
the output and input of system.
18. Write a short note on :
a) Avalanche Noise
b) Bipolar transistor noise
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021