Flapper nozzle is used in a/an ______________ controller?
Correct answer: C. Pneumatic
- A. Electronic
- B. Hydraulic
- C. Pneumatic
- D. None of these
Explanation
A flapper-nozzle arrangement converts a mechanical displacement into a pneumatic pressure signal, forming the basic transmitter or final-control element mechanism in pneumatic controllers. Electronic controllers use electrical signals instead.
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