EX-405 RGPV B.Tech
Control System (CS)
Previous year papers and the official syllabus are free to read, no account needed.
Previous Year Papers
7 papers, latest Dec 2025
- EX-405 paper, Dec 2025
- EX-405 paper, Jun 2025
- EX-405 paper, Dec 2024
- EX-405 paper, Jun 2024
- EX-405 paper, Nov 2023
- EX-405 paper, Jun 2023
Syllabus, notes and important questions for EX-405
Syllabus units
Topics as the official RGPV syllabus lists them.
Unit 1 Modeling of dynamic systems 11 topics
- Modeling of dynamic systems: Electrical, Mechanical and hydraulic systems
- Concept of transfer function
- Laplace Transform
- State space description of dynamic systems: Open and closed loop systems
- Signal flow graph
- Mason’s formula
- Components of control systems: Error detectors (Synchros & Potentiometer)
- Servomotors (AC & DC)
- Tacho‑generators
- Power amplifier
- Steerer motors
Unit 2 Time‑domain analysis of closed loop systems 5 topics
- Test signals
- Time response of first and second order systems
- Time domain performance specifications
- Steady state error & error constants
- Feedback control actions: Proportional, derivative and integral control
Unit 3 Stability 5 topics
- Routh‑Hurwitz stability analysis
- Characteristic equation of closed loop system
- Root loci construction
- Effect of adding poles and zeros on the loci
- Stability by root loci
Unit 4 Frequency‑domain analysis 5 topics
- Bode plots
- Effect of adding poles and zeros
- Polar plot
- Nyquist stability analysis
- Relative stability: Gain and phase margins
Unit 5 Design of control systems 6 topics
- Design of control systems with PD/PI/PID control in time domain and frequency domain
- Lead‑lag compensation
- Lag‑lead compensation
- Design of compensating networks
- Solution of state equation: Eigenvalues & eigenvectors
- Digitalization of state transition matrix
Exam insights
Counted from 7 past EX-405 papers.
Marks asked per paper, by unit
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Unit 1 Modeling of dynamic systems 27 marks
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Unit 2 Time – domain analysis of closed loop systems 24 marks
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Unit 3 Stability 17 marks
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Unit 4 Frequency, Domain analysis 22 marks
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Unit 5 Design of control systems 20 marks
Average marks of the questions from each unit in one paper. You answer only some of them, so the total is more than the paper’s maximum.
Asked again and again
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Use Mason's gain formula to determine the overall transfer function / gain from a given signal flow graph.
Asked 6 times: 2025, 2024, 2023, 2019
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Using Routh array, determine stability and number/location of roots with positive, zero and negative real parts for a given characteristic equation or open-loop transfer function.
Asked 5 times: 2025, 2024, 2023, 2019
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Sketch the Bode plot for a given transfer function and determine gain margin, phase margin, gain crossover frequency and phase crossover frequency, and comment on stability.
Asked 4 times: 2025, 2024, 2023