# Aerodynamics Questions and Answers – Uniform Flow

This set of Aerodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Uniform Flow”.

1. The tapering pipe is an example of __________

Explanation: A tapering pipe’s flow has a changing geometry. The tapered pipe’s cross section is not uniform, but the velocity of fluid flow remains constant throughout the flow. This category includes any duct with a non-uniform cross section but constant hydrostatic characteristics.

2. In unsteady flow, the streamline also changes from instant to instant.
a) true
b) false

Explanation: In an unstable flow, all of the hydrostatic characteristics, including velocity, fluctuate over time. When a tangent is drawn from any point in that flow field, the streamline determines the direction of flow. The streamlines shift as the velocity shifts.

3. What does the below figure show? a) streamlines
b) streaklines
c) pathlines
d) stream-tubes

Explanation: Stream-tubes are a collection of streamlines that form a conduit through which the flow travels. A lot of streamlines surround them. The fluid can enter or exit the surface through the stream-tubes’ ends.

4. In steady flow, pathline and stream lines are _____________
a) different
b) same
c) 0
d) slightly similar

Explanation: A pathline is the path that a fluid flow particle takes. A streamline, on the other hand, is a point in a fluid flow where a tangent may be drawn to show the direction of the fluid flow. In a steady flow, however, the velocity remains constant throughout the flow, resulting in the pathline and streamline becoming identical.

5. Two pathline can __________
a) intersect each other
b) cannot intersect each other
c) can meet at infinity
d) cannot meet ever

Explanation: Two pathlines may cross because the same particle or a different particle may reappear at the same location at a later time. Furthermore, a pathline is simply a path that a fluid particle follows. A path can be shared by two or more fluid particles.

6. Consider a fixed point in a flow. The locus of all the point passed through this fixed point is called as _________
a) stream-line
b) pathline
c) streak lines
d) stream tubes

Explanation: A streak line is the location of all the points that have passed past a given point. At any point in time, the flow will pass through a fixed point and flow to another. These points have a streamline locus.

7. Consider a flow over a flat plate of uniform cross section area, the flow moves at a constant speed. Due to a certain disturbance, there is a disturbance in the flow. In the given scenario, which of the following statement is true?
a) The flow remains uniform even after the disturbance
b) The flow remains uniform throughout
c) The flow is the first uniform and after disturbance undergoes non-uniformity
d) The disturbance will change the cross section area

Explanation: The flow is regular and steady in the beginning. The cross section of the flow remains unchanged after the disturbance, but the flow velocity varies and the flow becomes unstable.

8. In the below figure, which of the following flow is shown? a) Vortex flow
b) Uniform flow
c) Doublet flow
d) Source flow

Explanation: The term “uniform flow” refers to a flow in which each particle moves in a straight path at a consistent speed. In addition, the flow parameters in uniform flow do not alter over time. Throughout the flow, they remain consistent.

9. The flow in which the parameters do not change with respect to time is called as ________
b) transient flow