For fail-safe action the control valve should, upon energy (air) failure:
A. Open
B. Close
C. Move in such direction as to make the process nonhazardous
D. Stay in its previous position
Answer:C
For fail-safe action the control valve should, upon energy (air) failure:
A. Open B. Close C. Move in such direction as to make the process nonhazardous D. Stay in its previous position