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The shape of a mouthpiece that produces the highest discharge coefficient is

14. The shape of a mouthpiece that produces the highest discharge coefficient is:

1. Converging
2. Diverging
3. Converging-diverging
4. Cylindrical

Answer: C) Converging-diverging

Explanation:

The converging section accelerates the fluid and decreases pressure, while the diverging section slows down the fluid and allows for pressure recovery. This combination of effects results in improved discharge coefficients compared to simple converging or diverging shapes.