First Semester M.E. (C & I) Degree Examination, March 2013 (2K8 Scheme) Control and Instrumentation CI 113 : PROCESS CONTROL AND INSTRUMENTATION Time : 3 Hours
Max. Marks : 100
Instruction : Answer any five full questions. 1. a) With necessary assumptions, obtain the transfer function model of mercury thermometer and sketch the step response.
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b) Discuss the step response of a second order system for different cases of damping co-efficients ξ = 1, ξ = 0.5 and ξ = 2.4. Give an example.
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2. a) Obtain the transfer function for non-interacting system.
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b) Explain the advantages of a single loop PID controller over other composite control models.
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c) Define and compare ISE with IATE.
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3. a) Discuss the Zeigler-Nichol’s method of tuning a PID controller.
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b) A temperature control system inputs the controlled variable as a range from 0 to 4 V. The output is for a heater requiring 0 to 10 V. A PID is to be used with Kp = 2.5 %/%, KI= 9%/(% min), KD = 0.75% / (% min). The period of the fastest expected change is estimated to be IOS. Develop PID circuit for the design.
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4. a) Explain how a cascade controller reduces the effect of slow moving load disturbance in a process. Exemplify a Jacketed Kettle.
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b) Why feed forward control is preferred along with feedback control ? Explain feed forward control with neat diagram.
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P.T.O.
*EJM156*
EJM – 156
5. a) Discuss the Internal Model Control (IMC) structure and list the specifications required for IMC implementation.
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b) Find the working force resulting from 250 N applied to 2.5 cm radius forcing piston in a hydraulic actuator. i) If the working piston has a radius of 10 cm. ii) Also find the hydraulic pressure.
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6. a) Explain single and double seated valves.
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b) A machine needs to be automated to direct 10 bigger tins along one path for packaging and 20 smaller tins for packaging along another path. Develop the ladder diagram and explain. 7. Write short notes on the following : i) Adaptive control ii) Transportation lag iii) PID controller iv) Interfacing systems.
fastest expected change is estimated to be IOS. Develop PID circuit for the. design. 10. 4. a) Explain how a cascade controller reduces the effect of slow moving ...
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