ANS:D - In radial flow, flow is one dimensional with stream lines parallel.

The incorrect statement from the options provided is: In radial flow, flow is one dimensional with stream lines parallel. Explanation:

1. In radial flow, fluid flows such that pressure and velocity at any point change with respect to its distance from the central axis. This is true because in radial flow, the velocity and pressure vary as the fluid moves radially inward or outward from the central axis.
2. In radial flow, the velocity of flow is in a radial direction. This statement is correct. Radial flow occurs radially inward or outward from the center, which means the velocity vectors are directed radially.
3. In radial flow, flow may take place radially inward to or outward from the center. This is correct. Radial flow can occur in either direction, depending on the specific situation and conditions.
4. In radial flow, flow is one dimensional with streamlines parallel. This statement is incorrect. In radial flow, the flow is not necessarily one-dimensional, and the streamlines are not parallel. Radial flow involves flow in a radial direction, but it does not imply that the flow is one-dimensional or that the streamlines are parallel. The flow may have complex patterns and variations in velocity and pressure across the radial direction.