[amp_mcq option1=”parallel to central axis flow” option2=”parallel to outer surface of pipe” option3=”of equal yelocity in a flow” option4=”along which the pressure drop is uniform” correct=”option3″]
The correct answer is: C. of equal velocity in a flow.
A streamline is a line that is tangent to the velocity vector at each point along its length. This means that the velocity of the fluid is the same at all points along a streamline.
Option A is incorrect because a streamline is not necessarily parallel to the central axis of flow. For example, in a turbulent flow, the streamlines are often curved and do not follow a straight line.
Option B is incorrect because a streamline is not necessarily parallel to the outer surface of a pipe. For example, in a laminar flow, the streamlines are parallel to the pipe wall, but in a turbulent flow, the streamlines are often curved and do not follow a straight line.
Option D is incorrect because the pressure drop is not necessarily uniform along a streamline. For example, in a converging-diverging nozzle, the pressure drop is higher in the converging section than in the diverging section.
In conclusion, the correct answer is C. of equal velocity in a flow.