Exam Question
(a) Sketch a nozzle/flapper device used for the generation of a pneumatic signal, labelling the component parts. (10)
(b) Describe the operation of the device in (a) above. (6)
Class 4 (4th Engineer)
MEKG
📅 Feb 2026
Reference Answer
### (a) Sketch of a Nozzle/Flapper Device
A sketch would show the following key components, clearly labelled to illustrate the pneumatic circuit and mechanical interface:
1. **Air Supply:** A regulated source of clean, dry instrument air at a constant pressure (e.g., 1.4 bar or 20 psi).
2. **Fixed Restrictor (Orifice):** A component with a very small, fixed-diameter hole placed in the air supply line. Its function is to limit the maximum air flow into the nozzle chamber.
A sketch would show the following key components, clearly labelled to illustrate the pneumatic circuit and mechanical interface:
1. **Air Supply:** A regulated source of clean, dry instrument air at a constant pressure (e.g., 1.4 bar or 20 psi).
2. **Fixed Restrictor (Orifice):** A component with a very small, fixed-diameter hole placed in the air supply line. Its function is to limit the maximum air flow into the nozzle chamber.
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