Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

Large area but small mass
High thermal conductivity
Small specific heat
All of these

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

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