Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

Platinum-platinum + rhodium
Chromel-alumel
Copper-constantan
Iron-constantan

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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 indirect 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 direct acting

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