Engineering Questions with Answers - Multiple Choice Questions

# MCQs on Important Cases of Super Imposed Flow

1 - Question

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

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

2 - Question

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

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

3 - Question

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

c
Explanation: There is no such kind of superimposed flow.

4 - Question

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

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

5 - Question

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

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

6 - Question

What is the characteristic of stagnation point
a) Velocity is zero
b) Acceleration is uniform
c) Velocity is zero
d) Acceleration is zero

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

7 - Question

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

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

8 - Question

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

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

9 - Question

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

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

10 - Question

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