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Which type of vortex is generated when fluid flows out of a small opening, such as a drain in a sink?

18. Which type of vortex is generated when fluid flows out of a small opening, such as a drain in a sink?

1. Free vortex
2. Forced vortex
3. Rankine vortex
4. Solid body rotation

Answer: A) Free vortex.

Explanation:

A free vortex is created when fluid flows out of a small opening, and the velocity of the fluid decreases with increasing radius while conserving angular momentum.