# Fluid Mechanics Questions and Answers – Important Cases of Super Imposed Flow

This set of Fluid Mechanics online quiz focuses on “Important Cases of Super Imposed Flow”.

1. When a uniform flow is flowing through a doublet, resultant flow obtained is
a) Flow past a Rankine oval of equal axes
b) Flow past a circular cylinder
c) All of the mentioned
d) None of the mentioned

Explanation: They both mean the same thing. They are different ways of interpreting the same phenomenon.

2. How many stagnation points are present in a source and sink pair in a uniform flow
a) Two
b) Three
c) One
d) None

Explanation: There are two stagnation points are present in a source and sink pair in a uniform flow.

3. Which of the following is not a type of superimposed flow?
a) Source and sink pair in uniform flow.
b) Double flow
c) A source and sink pair in turbulent flow.
d) A plane source in uniform flow

Explanation: There is no such kind of superimposed flow.

4. In the equation for steam function due to source steam function is inversely proportional to magnitude at discharge
a) True
b) False

Explanation: Steam function is directly proportional to magnitude of discharge.

5. Streamlines of doublet flow are family of circles tangent to a common axis.
a) True
b) False

Explanation: This is special characteristic of doublet flow.
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6. What is the characteristic of stagnation point
a) Velocity is zero
b) Acceleration is uniform
c) Velocity is zero
d) Acceleration is zero

Explanation: At stagnation point velocity is zero, as the fluid comes at rest. This characteristic at stagnation point.

7. Potential lines for the source-sink pair will be eccentric non intersecting circles with their centers on the axis.
a) True
b) False

Explanation: The potential line for the source sink pair will be eccentric non intersecting circles with their centers on the axis.

8. What is the term used for a case where source and sink( both of them are of equal magnitude) approach each other such, distance between them reduces and product of distance and discharge magnitude remains constant.
a) A plain pair
b) A doublet source in uniform
c) Hagen Poiseuille flow
d) Coutte flow

Explanation: This is a special case of superimposed flow called double flow.

9. What type of flow is obtained by superimposing two definite flow types{( considering ideal condition)
a) Ideal
b) Potential
c) Both
d) None of the mentioned

Explanation: Any linear combination of two different types of flows will result in a potential and ideal flow.

10. The nature of streamlines in a flow net obtained by the combination of source and sink is-
a) Linear
b) Curvilinear
c) Circular
d) Random

Explanation: The combination of the source and sink would result in a flow net where streamlines will be circular axes.

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