Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Oil
Air
A metal powder or graphite
Mercury

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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 open valve with the controller direct acting
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

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