This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)
Roll No. β β β β β β β β β β β Total No. of Pages : 03
Total No. of Questions : 18
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B.Tech.(Automation & Robotics) (2012 & Onward) (Sem.-4)
LINEAR CONTROL SYSTEMS
Subject Code : BTEE-402
M.Code : 57108
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
SECTION-A
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Answer briefly :
- What are the advantages of Modern Control Theory over Classical Control Theory?
- Why is compensation required?
- What is the difference between absolute and relative stability?
- Write down Masonβs Gain Formula and describe each symbol.
- Define the term Damping ratio and discuss its effects on the output of any system.
- Describe Type of any system. Find the relation of static error constants w.r.t Type-I system.
- Draw circuit of Phase lag network and state the advantages of using it.
- What is the difference between Break-in and Break away Point?
- What do you mean by Sampled Data control system?
- Draw the F-V and F-I analogous circuit for following circuit of Fig. 1.
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FIG.1
SECTION-B
- A unity feedback control system having forward path transfer function G(s) = 16/[s(s + 1)]. Determine Οn and ΞΎ. If negative feedback of (1 +Ks) is introduced to forward path transfer function, find the value of K to reduce Mp from 75% to 25%.
- Derive the co-relation between Mp, Mr and Οr, Οd. Derive their relations and explain them graphically.
- The open loop transfer function of a ufb control system is given by :
K / (s+2)(s+4)(s^2 +6s+2)
By applying Routh Criterion, discuss the stability of the closed loop system as a function of K. Determine the value of K which will cause sustained oscillations in the closed loop system and also find corresponding oscillation frequencies? - Derive mathematical model for armature controlled D.C motor.
- Describe synchros as error detector.
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SECTION-C
- Find C/R using Block Diagram Reduction Technique. Verify your answer using SFG technique.
FIG.2
- Plot the Root Locii for the closed loop control system with G(s) = 1000 / s(s+1)(s^2 +4s+8)
- Sketch the Bode Plot for the transfer function G(s) = 10 / s(1 + .001s)
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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 download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)