Question:

It is required to control the volume of the contents in the jacketed reactor shown in the figure. 
 

Which one of the following schemes can be used for feedback control? 
 

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In feedback control, always measure the controlled variable and manipulate the actuator or valve that adjusts that variable.
Updated On: Jan 2, 2026
  • Measure L101 and manipulate valve V-2
  • Measure T101 and manipulate valve V-1
  • Measure L101 and manipulate valve V-3
  • Measure F101 and manipulate valve V-1
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The Correct Option is C

Solution and Explanation

In a feedback control system, the measurement of a controlled variable (in this case, liquid level) is used to manipulate a valve to regulate the system.

Step 1: Identify the controlled variable.
Here, the liquid level is controlled, which is measured by L101.

Step 2: Identify the manipulated variable.
The manipulated variable is V-2, which controls the inflow into the reactor, adjusting the volume.

Step 3: Conclusion.
Therefore, the correct feedback control scheme involves measuring L101 and manipulating valve V-2.

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