Process Control and Instrumentation
If response of a control system is to be free of offset and oscillation, the most suitable controller is

Proportional-derivative(PD)controller
Proportional-integral (PI) controller
Proportional controller
Proportional integral-derivative (PID) controller

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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

Unstable response
Overdamped response
Undamped response
Underdamped response

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Process Control and Instrumentation
Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are

Air to close valve with the controller direct acting
Air to close valve with the controller indirect acting
Air to open valve with the controller indirect acting
Air to open valve with the controller direct acting

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