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Monday, October 29, 2012

Introduction to Process Plant Control & Automation (Assignment Questions) Solution


ASSIGNMENT 2
‎2.1 Why process to be controlled?
ANS-  • Safety, environmental friendly, 
• operator friendly, 
• to improve product quality, 
• to increase production rate, 
• to meet specification, 
• most economical operating condition, 
• tougher competition, 
• reduced raw material cost, 
• extended equipment life, 
• reduced energy consumption, 
• stable plant operation (highly integrated plant with small surge capacities)


2.2 . List various steps in control system design?
ANS- 

1.  Formulate control objective

2. Select
 (a) controlled variable, 
(b) manipulated variable, 
(c) measured variable

3. Choose the control strategy & control structure

4. Specify the controller setting

Question 2.3 List PVs of stirred tank heating system?
ANS  •    Inlet fluid temperature Ti
• Outlet fluid temperature T
• Inlet fluid flow rate Wi
• Outlet fluid flow rate Wo
• Electrical heat inputs Q
o Change in heater R
o Change in Supply V
• Fluid level in tank
• Ambient temperature
Q. 2.4 List temperature control strategies of stirred tank heating system?
ANS• Method 1: measure T & adjust Q
• Method 2: measure Ti & adjust Q
• Method 3: measure T & adjust W
• Method 4: measure Ti & adjust W
• Method 5: measure T and T & adjust Q
• Method 6: measure T and T & adjust W
• Method 7: use a larger tank
2.9 What are the various control devices used for IA?
ANS Top of Form
There are following devices used for IA…
1. Digital Controller

2. PC based Control

3. PLC Based Control

4. PAC based Control

5. Conventional DCS Based Control

2.7 Which is the most appropriate temperature control strategy of stirred-tank heating system, why?

ANS  MEASURING T & Ti ADJUSTING Q

2.6 Why method 1& 2 combined and formed method 5?
ANS- Methods 1 & 2 are combined to form method 5 because it makes a combination of feedback as well as feedforward system

Q.2.5 List controlled variables, measured variable, manipulated variables and load variables in each of the above control strategies.

Q.2.8 List the elements of a feed back control loop:

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