B.TechSemester 52022-23Control SystemKEE-502

Control System (KEE-502) - AKTU Question Paper 2022-23

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 2022-23. 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:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Control System (KEE-502) — complete question paper

Section AAttempt all questions in brief. 2x10 = 20

a
Define transfer function of a control system
b
What is Mason’s gain formula? Explain
c
A unity feedback system with open-loop transfer function G(s) =2/[s(s+p)] is critically damped. Calculate the value of p?
d
Explain the effects of PD and PI control action on a second o r d e r s y s t e m performance
e
Explain the special cases of Routh Hurwitz criterion
f
Define the Centroid and Breakaway point
g
Define relative stability of the system
h
Explain gain margin and phase margin in terms of Bode plot. (i) Define state variable and state vector. (j) Mention any four propertie s of state transition matrix

Section BAttempt any three of the following: 10x3 = 30

a
Find C(s)/R(s) using Mason’s gain formula for the given signal flow graph given below
b
With neat sketch e xplain all time domain specifications for a second order control system and derive the formula for peak time
c
What do you mean by the root locus? State and explain all t he steps used for drawing the root locus plot
d
Sketch the polar plot and determine the gain crossover freq uency, phase crossover frequency, gain margin and phase margin with given op en loop transfer function given below. Also comment on the stability of the system. 1)( ssssG 
e
Find the state tra nsition matrix for matrix A given below

Section CAttempt any one part of the following: 10x1 = 10

a
Explain open loop and closed loop control system with a sui table example in each case
b
Using block reduction technique calculate transfer function of the block diagram given below
a
Derive the time response of a second order control system f or unit step input
b
The open loop transfer function of a unity feedback control system is given )1()(  sTs The system input is a unit step function. Determine- (i) By what factor amplifier gain K should be multiplied so that the damping ratio is increased from 0.3 to 0.9. (ii) By what factor the time constant T should be multiplied so that the damping ratio is reduced from 0.8 to 0.2
a
Sketch the root locus plot and give the stability condition s for the system when open loop transfer function is given by KGsHs ss s s 
b
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
a
Define resonant peak ( rM ) resonant frequency ( r ) and derive the formula for them
b
Draw the Bode plot fo r the open loop T.F. and from thegraph determine (i) Gain cross-over frequency (ii) Phase cross-over frequency (iii) Gain margin (iv) Phase margin (v) Stability of the system
a
What are the different types of compensators used in contro l system? Discuss lead compensator and derive the relation between maximum lead a ngle Ф m and α
b
Examine the controllability and observability of a system with

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 — KEE-502

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

Define transfer function of a control system