Process Control and Instrumentation
Pick out the first order system from among the following.

Non-interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water
Damped vibrator
Interacting system of two tanks in series

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Process Control and Instrumentation
In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T₁s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit

Overdamped response
Underdamped response
Unstable response
Undamped response

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