This set of Aerodynamics online test focuses on “Three Dimensional Doublet”.

1. Is source and sink are equal?

a) True

b) False

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Explanation: The source and sink are equal but opposite strength located at points O and A, as sketched. The distance between the source and sink is l. consider an arbitrary point p located a distance r from the sink and a distance from the source, so source and sink are equal but opposite in strength.

2. Is strengths of source and sink becomes infinite?

a) False

b) True

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Explanation: As the source and the sink approach as their strengths become infinite. That the flow field produced by the equation is a three dimensional doublet. The three dimensional doublet has defined the strength of the doublet with its two dimensional.

3. Is three dimensional doublet is defined as the strength of the doublet?

a) False

b) True

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Explanation: The three dimensional doublet is defined as the strength of the doublet, compare equation with its two dimensional counterpart given in equation. Note that the three dimensional effects lead to an inverse squared variation.

4. Is three dimensional effect lead to an inverse squared variation?

a) True

b) False

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Explanation: The three dimensional effects lead to an inverse squared variation and introduce into the two dimensional case. The stream lines of this velocity field are sketched in the figure are the stream lines in the planes.

5. Is flow induced by the three dimensional doublet is a series of stream surfaces?

a) True

b) False

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Explanation: The flow induced by the three dimensional doublet is a series of stream surfaces generated by revolving the streamlines in about the r axis. Compare these stream lines with the two dimensional case illustrated they are qualitatively different.

6. Is flow is defined as axisymmetric flow?

a) True

b) False

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Explanation: The flow is independent of indeed equation clearly shows that the velocity field depends only on r. such a flow is defined as axisymmetric flow. Once again, we have a flow with two independent variables with the axisymmetric flow.

7. Is axisymmetric flow sometimes labeled as two dimensional flow?

a) True

b) False

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Explanation: The axisymmetric flow is sometimes labeled as two dimensional flow. However, it is quite different from the two dimensional planar flows discussed earlier. In reality, axisymmetric flow is degenerate three dimensional flow.

8. Is axisymmetric has two independent variables?

a) True

b) False

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Explanation: The axisymmetric flow is a degenerate three dimensional flow, and it is somewhat misleading to refer it as the two dimensional, and the axisymmetric flow has only two independent variables, but it exhibits some of the same physical characteristics.

9. Is doublet is the combination of source and sink?

a) True

b) False

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Explanation: The degenerate case of a source sink pair that leads to a singularity called a doublet. The doublet is frequently used in the theory of incompressible flow, the purpose of this section is to describe its properties.

10. Is zero is the absolute magnitudes of the source and sink?

a) True

b) False

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Explanation: The distance zero is the absolute magnitudes of the strengths of the source and sinks increases in such a fashion that product remains constant. This limiting process we obtain by a special flow pattern defined as a doublet.

**Sanfoundry Global Education & Learning Series – Aerodynamics.**

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