GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Seat No.:
Subject Code: 2151908
Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019
Subject Name: Control Engineering
Time: 10:30 AM TO 01:00 PM
Date: 18/12/2019
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Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q | Question | MARKS |
|---|---|---|
| Q1 (a) | What is control Engineering? Classify it | 03 |
| (b) | What is state space analysis in control engineering? Explain advantage of state variable method over conventional one. | 04 |
| (c) | Determine the system equations for the physical system shown in figure 1. | 03 |
| Q2 (a) | Derive equation of transfer function for closed loop control system | 04 |
| (b) | What is analogues system? Explain force voltage analogy | 07 |
| (c) | Reduce block diagram by block reduction technique and find the overall transfer function in figure 2. | 03 |
| OR | ||
| Q3 (a) | Apply masons rule and find the transfer function for following figure.2 | 04 |
| (b) | Explain standard test signals used in control engineering | 07 |
| (c) | For a first order system with unit step input find the steady state error and explain it | 03 |
| Q.4 (a) | A unity feed back control system has an open loop transfer function G(s) = 5/s(s+1) find the peak time, rise time, percentage overshoot settling time for step input of 20 units. Also determine the peak overshoot. | 04 |
| OR | ||
| Q.4 (b) | Define position error constant, velocity error constant, Acceleration error constant. | 07 |
| Q.5 (a) | Derive the equation for peak time, rise time, and for second order system for underdamped system | 03 |
| (b) | The control system shown in figure 3 employs proportional plus error rate control. Determine the value of error rate constant Ke, so that damping ratio is 0.5. Determine the value of settling time, maximum overshoot. Find the steady state error if the input is unit ramp input. | 04 |
| (c) | Explain nozzle flapper amplifier | 07 |
| Q.5 (a) | Explain basic hydraulic system component and draw any circuit showing at least six components | 03 |
| (b) | Explain pneumatic proportional plus integral control action and obtain its transfer function. | 04 |
| OR | ||
| (c) | Differentiate hydraulic and pneumatic control system | 07 |
| (a) | Explain 3/2 DCV, 3/3 DCV, directional control valve with its construction figure. | 03 |
| (b) | Obtain the transfer function for hydraulic system with proportional plus integral plus derivative control action. | 04 |
| (c) | Explain terms; stable system, unstable system, marginally stable system | 07 |
| (a) | Write a short not on bode plot | 03 |
| (b) | For a system having charactetistic polynomial S5+ 4S4+16S3 +41S2 +36S +72 discuss about the stability criteria using routh stability theory. | 04 |
| OR | ||
| (c) | Explain terms; critically stable system, conditionally stable system, relative stability | 07 |
| (a) | Write a short note on Niquest stability criteria. | 03 |
| (b) | Sketch the root locus of the system whose open loop transfer function is G(s) = K/S(S+1)(S+3), determine the value of K for damping ratio equal 0.5 | 04 |
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