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chemical engineering process control and instrumentation
1. 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
(A): air to close valve with the controller direct acting.
(B): air to close valve with the controller indirect acting.
(C): air to open valve with the controller direct acting.
(D): air to open valve with the controller indirect acting.
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