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For a steady two-dimensional flow, if the streamlines and equipotential lines coincide, what can be said about the flow?

13. For a steady two-dimensional flow, if the streamlines and equipotential lines coincide, what can be said about the flow?

1. It is irrotational
2. It is rotational
3. It is compressible
4. It is viscous

Answer: A) It is irrotational.

Explanation:

When the streamlines and equipotential lines coincide, it implies that the flow is irrotational (no vorticity) and can be described using a velocity potential function. This is a characteristic of irrotational flow behavior.