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)
• 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
(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
• 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
• 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
There
are following devices used for IA…
1. Digital Controller
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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