Download PTU B.Tech 2021 Jan ECE 5th Sem 78760 Control Systems Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January ECE 5th Sem 78760 Control Systems Previous Question Paper

Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ECE) (Sem.?5)
CONTROL SYSTEMS
Subject Code : UC-BTEC-504-18
M.Code : 78760
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.
Differentiate between open loop and closed loop control systems.
2.
What do you mean by Linear Variable Differential Transformer (LVDT)?
3.
How do servomotors contribute in Control Systems?
4.
Write the impact of Insensitivity on Control Systems.
5.
How polar plot is different from Nyquist plot?
6.
What is the difference between Absolute and Relative stability?
7.
Write the importance of comparators in control systems.
8.
What do you mean by state space?
9.
Why is it important to remove the disturbance for the stability of the control systems?
10. Define the significance of time constant in first order systems.
1 | M - 7 8 7 6 0
( S 2 ) - 7 4 4

---

SECTION-B
11. Discuss the mathematical modelling of Electrical systems.
12. Discuss the time response of the first order control system subjected to unit impulse input
function.
13. The open loop transfer function of a unity feedback control system is given by
K
G(s) =
s(sT +1) (sT +1)
1
2
Apply routh criteria to determine the value of K in term of T1 and T2 for system to be
stable.
14. Determine the transfer matrix from the data given below :
3
1
1
A =
B
C=
1
1 and D=0
0
1
1
15. Discuss about digital implementation of comparators.
SECTION-C
16. Sketch the Bode plot for the open loop transfer function for the system given below and
comment upon the stability of the system.
50
G(s)H(s)=
(s 1)(s 2)
17. a) What do you mean by Industrial control system. Discuss any two examples.
b) Discuss the importance of steady state accuracy in control systems.
18. Discuss about the followings
a) Pneumatic Valves
b) Proportional Control Systems
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.
2 | M - 7 8 7 6 0
( S 2 ) - 7 4 4

---