Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Oxidation resistance
Non-linear relation of emf to temperature
Corrosion resistance
Linear relation of emf to temperature

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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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