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EK-General : 2015/OCT/05 – 2017/OCT/02 – 2020/AUG/02 – 2024/JUL/02
Question
Q2. With reference to pneumatically operated control valves:
(a) state the reason for fitting valve positioners; (4)
(b) with the aid of a sketch, explain valve hysteresis and how it affects the process; (3)
(c) describe how the design and routine maintenance can limit hysteresis. (3)
Asked in Year/Month/Ques No.