FACULTY OF ENGINEERING B.E. 3/4 (Inst.) II – Semester (New) (Main) Examination, April / May 2013 Subject : Process Control Time : 3 hours
Max. Marks : 75
Note: Answer all questions from Part-A. Answer any FIVE questions from Part-B. PART – A (25 Marks) 1. What is dead time process?
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2. What is Gibb’s phase rule?
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3. What are the merits and demerits of integral action?
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4. Identify control action.
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5. What is tuning of controllers?
2
6. Determine offset.
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7. What are the different signal transmission standards in process industries?
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8. Find the valve coefficient for pumping liquid flow rate 600 m3/sec. with a maximum pressure of 55 Psi. The liquid specific gravity is 1.3
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9. Draw the Ladder logic for AND Gate.
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10. What is the function of “watchdog timer” in PLC architecture.
2
PART – B (50 Marks) 11.a) Obtain process transfer function
H 2 (s) for given non-interacting system. Qi ( s )
b) Obtain an expression for resistance element for turbulent flow.
7
3 ..2
Code No. 2377 / N -212. Explain in detail P + I controller and also obtain it’s electronic implementation. 13.a) Explain Zeigler-Nichols method.
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b) In Zeigler-Nichols method, the critical gain was found to be 4.2 and critical period was 2.21 minutes. Find the standard settings for PID control. 14.a) Explain pneumatic actuators.
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b) Explain pneumatic P + D controller. 15.a) Explain control valve characteristics. b) An equal percentage valve has rangeability of 32. If the maximum flow rate is 100 m3/sec and the full travel is 3 cm, find the flow at a 1-cm opening. 16. What is Ladder diagram? Explain Ladder diagram elements.
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17. Write short notes on : a) ON-OFF controller b) PLC scan c) Time – constant element
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