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 open valve with the controller direct acting
(B) Air to close valve with the controller indirect acting
(C) Air to open valve with the controller indirect acting
(D) Air to close valve with the controller direct acting
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