Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Reduce measuring lag
Increase the fidelity
Guard against corrosive and oxidising action on thermocouple materials
Increase the sensitivity

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Process Control and Instrumentation
The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system

Is the same for set point or load changes
All of these
Determines its stability
Depends only upon the open loop transfer function

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Process Control and Instrumentation
For a feed back control system to be stable, the

Bode plots of the corresponding open loop transfer function should monotoni-cally decrease
Roots of the characteristic equation should be real
Poles of the closed loop transfer function should lie in the right half of the complex plane
Poles of the closed loop transfer function should lie in the left half of the complex plane

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