Q.1
14 Marks(a)
Define the terms: a) Control variable b) Plant c) Process
(b)
Explain with examples: open loop and close loop control system. Explain with suitable example.
(c)
Explain force current analogy with proper example.
Gujarat Technological UniversitySummer 2026 examination
GTU 3151908 Control Engineering Summer 2026 Question Paper & PDF
B.E. · Mechanical Engineering · Semester 5 · Subject code 3151908
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 2:30 PM – 5:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Classify the type of control systems and explain time variant system with suitable example.
(b)
Explain the analysis of gear train with inertia and friction.
(c)
Derive the transfer function of simple liquid level system with interaction.
OR
(c)
Define thermal resistance and thermal capacitance. Also derive the transfer function of Thermometer placed in water bath as a Thermal system.
Q.3
14 Marks(a)
Derive Correlation Between Transfer Functions and State-Space Equations.
(b)
Define and explain the following terms related to the transfer function of a system. Poles, Zeros, Characteristic equation, order.
(c)
Determine the transfer function of system if impulse response of system is e-2tsin 5t
OR
(a)
Define: State variable, state vector and state space
(b)
Enlist Advantage and Disadvantages of state space analysis technique.
(c)
What is force voltage analogous system? Which are the analogues quantities according to this method?
Q.4
14 Marks(a)
Explain the following terms: Delay time, Rise time, Peak time.
(b)
Compare Routh’s stability criteria and Nyquist stability criteria.
(c)
Explain pneumatic force-balance type Proportional controller with neat sketch and state limitations.
OR
(a)
What is Phase margin and Gain margin? State importance of it.
(b)
Define the following terms. Stable systems, Unstable system, Critically stable system
(c)
Consider a closed loop system defined by s4+3s3+5s2+7s+K=0. Determine the range of K for which the system is stable using Routh-Hurwitz stabiliy criterion.
Q.5
14 Marks(a)
Explain when the system is said to be underdamped, overdamped and critically damped for a second order unity feedback control system with step input.
(b)
Discuss the effect of adding integral control action to a first order unity feedback proportional control system with step input.
(c)
List all the steps to sketch the Bode plot.
OR
(a)
Explain nozzle -flapper amplification in a pneumatic system.
(b)
Explain tuning of PID controller in brief.
(c)
List all the steps to sketch the Polar plot.
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About this paper
Official Gujarat Technological University (GTU) examination paper for Control Engineering (Summer 2026, B.E. · Mechanical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.