B.TechSemester 62023-24Control SystemKEC602

Control System (KEC602) - AKTU Question Paper 2023-24

B.Tech · Semester 6 · Free PDF Download

This is the official AKTU Control System Previous Year Question Paper for B.Tech Semester 6, 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 6

Session:2023-24

University:AKTU / UPTU

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Questions Asked in 2023-24

Control System (KEC602) — 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
What is the difference between an open and closed loop system? 2 1
b
In most of the cases, disturbances are introduced in process i n closed loop control system. Why?
c
What are the conditions for a system to be controllable? 2 2
d
What are the advantages of stat e-space model over transfer function? 2 2
e
What is the advantage of calculating overshoot control system? 2 3
f
What is the difference between fall time and rise time? 2 3
g
How location of poles is related to stability? 2 4
h
How is departure angle measured? 2 4 i. What is the significance of gain and phase margin? 2 5 j. What is the significance of polar coordinates? 2 5

Section BAttempt any three o f t h e f o l l o w i n g :

a
Obtain the Transfer function of the given block diagram
b
Derive a state space model for the system shown. The input is τa and the output is θ1
c
The open loop transfer function of a unity feedback system is given by Where ‘K’ & ‘T’ are positive constants. By what factor should t he amplifier gain be reduced so that the peak overshoot of unit step response of the system is reduced from 75% to 25%
d
Using Routh Hurwitz Criterion, discuss the stability of the cha racteristic equation
e
What is gain margin, phase margin, gain crossover frequency, and phase cross frequency? What is the practical use of these parameters?

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

a
Construct the signal flow gra ph for the following set of sim ultaneous equations and obtain the overall transfer function using Mason‘ s gain formula
b
Reduce the block diagram to i ts canonical form and obtain C(S)/R(S)
a
For a single input system Check the controllability & observability of the system
b
Examine the Controllability and Observability of the following system
a
Consider a standard second order system given by The correlation between the maximum peak overshoot in the time domain and the resonant peak in the frequency domain exists when
b
The output of a standard second- order system for a unit-step input is given as What is the transfer function of the system?
a
Using Routh Hurwitz Criterion, discuss the stability of the cha racteristic equation
b
Consider a unity-feedback con trol system with the following feedforward transfer function: Draw plot the root locus
a
Sketch the Bode Plot for the given system and comment on stability of the used systems
b
Construct the Bode plots for a unity feedback system whose open-loop transfer function is given by [0.25(1+0.5s)]/ [s(1+2s)(1+4s)]. From the Bode plot, determine the following
a
Gain and phase crossover frequencies
b
Gain and phase margin, and
c
Comment on the stabilit y of the system

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 — KEC602

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

What is the difference between an open and closed loop system? 2 1

Appeared in: 2022-23 · 2023-24

What are the conditions for a system to be controllable? 2 2