R5311306-process Control
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1
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Define the state variables and state equations? (b) Why mathematical model is required in a process control system. (c) Discuss the dynamics of temperature process with an example.
[4+4+8]
2. (a) Define Controller? (b) Explain the principle of different types of discontinuous controller modes with examples. And mention their applications. [4+12] 3. (a) Explain the operation of any one method of electrical transmission with closed loop. What are the advantages of electrical transmission? (b) Write short notes on Electromagnetic flow meter.
[8+8]
4. (a) Explain the principle of operation of a displacement type pneumatic proportional controller. (b) Outline the design steps involved in the implementation of an electronic controller and explain. [8+8] 5. (a) Differentiate between direct action and reverse action final control operation. (b) Write about requirements of pressure drop across the valve for better control of flow. [8+8] 6. (a) Write short notes on heat exchangers. (b) Implement control system for boiler drum level control.
[8+8]
7. Briefly explain the principles governing the conduct of reactions in chemical process. [16] 8. Briefly write about the mass transfer operations. ?????
[16]
2
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Obtain the expression for the resistance and capacitance for thermal system. (b) Write the characteristics of liquid level system.
[8+8]
2. (a) Describe with necessary equations, the concept of single controller mode, which is sluggish in nature. (b) The reset action of an integral controller is 2.8 min. Express the integral controller constant in sec−1 . What is the output of the controller to a constant error of 3.5% [8+8] 3. Briefly explain the various methods of measuring temperature.
[16]
4. (a) What are the advantages of force type pneumatic controller? Describe with neat diagrams, the working of a force type pneumatic proportional controller. (b) With necessary diagrams, describe the hydraulic integral controller. Explain how integral time can be adjusted. [8+8] 5. (a) Discuss about the working of electro-pneumatic converter? (b) What is control valve? Describe the operation of butterfly valve. And mention it types. [8+8] 6. Describe briefly how the pressure of the steam is controlled in the boiler drum with mathematical explanation. [16] 7. Write short notes on controlling conversion in a reactor.
[16]
8. With suitable diagrams explain the operations involved in nuclear power plant.
[16]
?????
3
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Define the state variables and state equations? (b) Why mathematical model is required in a process control system. (c) Discuss the dynamics of temperature process with an example.
[4+4+8]
2. (a) Briefly explain the control modes. (b) An integral controller is used for speed control with a set point of 15 rpm, range of 10 to 20 rpm. The integral constant KI = -0.2% controller output per second per percentage error. The controller output is 28% initially. If the speed jumps to 17 rpm, calculate the controller output after 3sec for a constant error. [8+8] 3. (a) Compare with electric transmission with pneumatic transmission. (b) Explain the principle and working of a Bolometer.
[8+8]
4. (a) Explain the principle of operation of a displacement type pneumatic proportional controller. (b) Outline the design steps involved in the implementation of an electronic controller and explain. [8+8] 5. Explain the different types of sliding stem valves.
[16]
6. (a) How can you measure the steam flow rate in boiler? Give mathematical equation. (b) Discuss about control of fuel and air in combustion control.
[8+8]
7. Discuss the controllability and conversion rate in plug flow and back mixed reactors. [16] 8. What is inferential control? Explain how it is used in controlling the rate of drying. [16] ?????
4
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Derive the transfer function of mercury thermometer. (b) Explain the generalized process control loop with neat diagram.
[8+8]
2. (a) Draw the o/p of the i. three position controller ii. single speed floating controller for the following error. Assume the relevant settings,as shown in the below figure 1
Figure 1: (b) Write the differences between PI and PID controllers.
[8+8]
3. Briefly explain the various methods of measuring temperature.
[16]
4. (a) Explain the principle of operation of force type pneumatic proportional controller. (b) Write short notes on valve sizing.
[8+8]
5. (a) Differentiate between direct action and reverse action final control operation. (b) Write about requirements of pressure drop across the valve for better control of flow. [8+8] 6. Draw simple schematic of heat exchanger and explain the control. How bypassing the heat exchanger improves dynamic response. [16] 7. (a) Discuss the stability of exothermic reactors. (b) Write about the stability of endothermic reactors.
[12+4]
8. What is inferential control? Explain how it is used in controlling the rate of drying. [16] ?????
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Define the state variables and state equations? (b) Why mathematical model is required in a process control system. (c) Discuss the dynamics of temperature process with an example.
[4+4+8]
2. (a) Define Controller? (b) Explain the principle of different types of discontinuous controller modes with examples. And mention their applications. [4+12] 3. (a) Explain the operation of any one method of electrical transmission with closed loop. What are the advantages of electrical transmission? (b) Write short notes on Electromagnetic flow meter.
[8+8]
4. (a) Explain the principle of operation of a displacement type pneumatic proportional controller. (b) Outline the design steps involved in the implementation of an electronic controller and explain. [8+8] 5. (a) Differentiate between direct action and reverse action final control operation. (b) Write about requirements of pressure drop across the valve for better control of flow. [8+8] 6. (a) Write short notes on heat exchangers. (b) Implement control system for boiler drum level control.
[8+8]
7. Briefly explain the principles governing the conduct of reactions in chemical process. [16] 8. Briefly write about the mass transfer operations. ?????
[16]
2
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Obtain the expression for the resistance and capacitance for thermal system. (b) Write the characteristics of liquid level system.
[8+8]
2. (a) Describe with necessary equations, the concept of single controller mode, which is sluggish in nature. (b) The reset action of an integral controller is 2.8 min. Express the integral controller constant in sec−1 . What is the output of the controller to a constant error of 3.5% [8+8] 3. Briefly explain the various methods of measuring temperature.
[16]
4. (a) What are the advantages of force type pneumatic controller? Describe with neat diagrams, the working of a force type pneumatic proportional controller. (b) With necessary diagrams, describe the hydraulic integral controller. Explain how integral time can be adjusted. [8+8] 5. (a) Discuss about the working of electro-pneumatic converter? (b) What is control valve? Describe the operation of butterfly valve. And mention it types. [8+8] 6. Describe briefly how the pressure of the steam is controlled in the boiler drum with mathematical explanation. [16] 7. Write short notes on controlling conversion in a reactor.
[16]
8. With suitable diagrams explain the operations involved in nuclear power plant.
[16]
?????
3
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Define the state variables and state equations? (b) Why mathematical model is required in a process control system. (c) Discuss the dynamics of temperature process with an example.
[4+4+8]
2. (a) Briefly explain the control modes. (b) An integral controller is used for speed control with a set point of 15 rpm, range of 10 to 20 rpm. The integral constant KI = -0.2% controller output per second per percentage error. The controller output is 28% initially. If the speed jumps to 17 rpm, calculate the controller output after 3sec for a constant error. [8+8] 3. (a) Compare with electric transmission with pneumatic transmission. (b) Explain the principle and working of a Bolometer.
[8+8]
4. (a) Explain the principle of operation of a displacement type pneumatic proportional controller. (b) Outline the design steps involved in the implementation of an electronic controller and explain. [8+8] 5. Explain the different types of sliding stem valves.
[16]
6. (a) How can you measure the steam flow rate in boiler? Give mathematical equation. (b) Discuss about control of fuel and air in combustion control.
[8+8]
7. Discuss the controllability and conversion rate in plug flow and back mixed reactors. [16] 8. What is inferential control? Explain how it is used in controlling the rate of drying. [16] ?????
4
Code No: R5311306
III B.Tech I Semester(R05) Supplementary Examinations, May 2009 PROCESS CONTROL (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Derive the transfer function of mercury thermometer. (b) Explain the generalized process control loop with neat diagram.
[8+8]
2. (a) Draw the o/p of the i. three position controller ii. single speed floating controller for the following error. Assume the relevant settings,as shown in the below figure 1
Figure 1: (b) Write the differences between PI and PID controllers.
[8+8]
3. Briefly explain the various methods of measuring temperature.
[16]
4. (a) Explain the principle of operation of force type pneumatic proportional controller. (b) Write short notes on valve sizing.
[8+8]
5. (a) Differentiate between direct action and reverse action final control operation. (b) Write about requirements of pressure drop across the valve for better control of flow. [8+8] 6. Draw simple schematic of heat exchanger and explain the control. How bypassing the heat exchanger improves dynamic response. [16] 7. (a) Discuss the stability of exothermic reactors. (b) Write about the stability of endothermic reactors.
[12+4]
8. What is inferential control? Explain how it is used in controlling the rate of drying. [16] ?????
