Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (ECE)-Electronics And Communications Engineering 2020 December 4th Sem 57594 Signals And Systems Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ECE/Electronics Engg/Electronics & Computer Engg)
(2012 to 2017) (Sem.?4 )
SIGNALS AND SYSTEMS
Subject Code : BTEC-402
M.Code : 57594
Time : 3 Hrs.
Max. Marks :60
INSTRUCTIONS TO CANDIDATES :
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
Answer briefly :
Q1 What are the classifications of continuous time signals?
Q2 Compare energy and power signal.
Q3 Define Fourier transform and Z-transform.
Q4 Define Ensemble.
Q5 What is the condition of LTI system to be stable?
Q6 What do you mean by impulse response of any system?
Q7 What is the significance of difference equations?
Q8 State Bayes theorem.
Q9 Define Central Limit Theorem.
Q10 What are the steps to perform convolution?
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SECTION-B
Q11 Determine the Fourier series representation for x(t) = 2 sin(2t ? 3) + sin(6t).
Q12 Prove that for BIBO stable discrete time LTI system the ROC of the system function
includes unit circle.
Q13 Find Fourier transform of unit step function.
Q14 State and prove sampling theorem for low pass signals.
Q15 Derive the relation between correlation and convolution between two sequences.
SECTION-C
Q16 A continuous time LTI system is described by the difference equation:
d/dt y(t) + 5 y(t) =x(t)
Determine, the response of the system to the input x(t) =e-2t u(t) using Fourier Transform.
Q17 A discrete time LTI system is given by y(n) ? ? y(n?1) =x (n) + x(n?1), Determine,
frequency response and impulse response of the system.
Q18 Compute Z- transform and ROC of the signal (1/2)n u(n), plot Pole-Zero pattern.
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