Step 1: Understanding the nozzle-flapper system.
A pneumatic nozzle-flapper system is typically used in control systems, where small mechanical displacements of the flapper lead to significant changes in output pressure. This pressure change is controlled and amplified to operate various pneumatic devices.
Step 2: Analyzing the options.
- (A) Incorrect, the system is not designed to change temperature significantly based on velocity.
- (B) Incorrect, the system does not typically focus on temperature control.
- (C) Incorrect, while velocity may affect the system, it is primarily used for pressure control, not velocity-to-pressure conversion.
- (D) Correct, the nozzle-flapper system converts small changes in flapper displacement into large changes in output pressure.
Step 3: Conclusion.
The correct answer is (D) Small changes in flapper’s displacement to large changes in output pressure.