B.TechSemester 52023-24Control SystemKEE502

Control System (KEE502) - AKTU Question Paper 2023-24

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Control System Previous Year Question Paper for B.Tech Semester 5, academic session 2023-24. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 5

Session:2023-24

University:AKTU / UPTU

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Questions Asked in 2023-24

Control System (KEE502) — complete question paper · 100 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f . 2 x 1 0 = 2 0

a
Explain the properties of signal flow graph. 2 1
b
Define transfer function of a control system. 2 1
c
Mention the effect of ξ on second order system performance for unit step input when (i) ξ = 0, (ii) 0 < ξ < 1, (iii) ξ = 1, (iv) 1 < ξ < ∞
d
What are the standard test signals? Explain. 2 2
e
On the basis of bounded input bounded output stability define stable system and unstable system
f
List the disadvantages of R outh-Hurwitz criterion. 2 3
g
Describe the resonant peak and resonant frequency. 2 4
h
Explain the minimum and non-minimum phase system. 2 4 i. List the advantages of state variable approach for the analysi s of a control system. j. Define state space and state trajectory. 2 5

Section BAttempt any three o f t h e f o l l o w i n g : 10x3=30

a
Determine the transfer functi on for the block diagram given below by Mason’s gain formula
b
Explain the following terms in detail
c
The open loop T.F. of certain unity feedback system is  sss sKsG Determine- i. Range of K for stability ii. Marginal value of K iii. Location of roots for marginal stability
d
What is mapping theorem? Also explain the Nyquist stability criterion to determine the stability of a control system
e
Determine the transfer functi on from the state model given below

Section CAttempt any one p a r t o f t h e f o l l o w i n g : 10x1=10

a
What do you understand by open loop and closed loop control systems? Discuss the comparative statements between open loop and closed loop control systems. Also explain th e practical examples of open lo op and closed loop control systems
b
Determine C(S)/R(S) for the f ollowing system using block red uction method
a
Define peak time and peak ove rshoot of a second order contro l system and derive the formula for the same with unit step input
b
The maximum overshoot for a unity feedback control system ha ving its forward path transfer function as () (1 ) KGs ss T  is to be reduce from 75% to 25%. The system input is a unit step function. Determine the factor by which K should be reduced to achieve the above reduction
a
What do you mean by the root locus? State and explain all th e steps used for drawing the root locus plot
b
Sketch the root locus plot and comment on stability for the system when open loop transfer function is given by- KGsH S ss s s 
a
Draw the Nyquist plot and dete rmine the stability of the system whose open loop transfer function is given as. sGsHs ss s
b
Draw the Bode plot for the open loop T.F. and from the graph determine- (i). Gain cross-over frequency, (ii). Phase cross-over frequency (iii). Gain margin, (iv).Phase margin , (v). Comment on the stability of the system
a
What are the different types of compensators used in control systems? Also show that the frequency corresponding to the maximum lead angle (ωm) is the geometric mean of the two corner frequencies of the le ad compensator
b
Examine the controllability and observability of a system wi th

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — KEE502

Questions that appeared in more than one session, found by comparing 3 years of Control System papers (2021-22, 2022-23, 2023-24)

List the disadvantages of R outh-Hurwitz criterion. 2 3

Appeared in: 2021-22 · 2022-23 · 2023-24

Define transfer function of a control system. 2 1