# Fluid Mechanics Questions and Answers – Types of Motion and Vortex Flow

This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Types of Motion and Vortex Flow”.

1. When fluid element moves from one position to another, what type of motion is it?
a) Linear Translation
b) Linear Deformation
c) Angular Deformation
d) Rotation

Explanation: As per the definition, bodily movement of fluid element is translation.

2. When fluid element moves from one position to another and it undergoes c hange in its dimensions, what type of motion is it?
a) Linear Translation
b) Linear Deformation
c) Angular Deformation
d) Rotation

Explanation: As per the definition, bodily movement of fluid element causing it to change its dimension is linear deformation.

3. If there is change in angle contained by two sides. the average of the angle is
a) Linear Translation
b) Linear Deformation
c) Angular Deformation
d) Rotation

Explanation: As per the definition, the sum average of two angles is magnitude of angular deformation.

4. What is the magnitude of vorticity?
a) Twice of angular rotation
b) Thrice of angular rotation
c) Two and half times of angular rotation
d) Same as angular rotation

Explanation: It is the mathematical relation between the two.

5. The flow of fluid along curvilinear or curved path is known as
a) Curvilinear Flow
b) Circular Flow
c) Sink Flow
d) Vortex Flow

Explanation: The flow of fluid along curvilinear or curved path is known as Vortex flow.
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6. When external torque is absent the type of vortex flow is
a) Circular vortex flow
b) Independent vortex flow
c) Free vortex flow
d) None of the mentioned

Explanation: Free vortex flow is due to the absence of any external force.

7. Which of the following is not an example of forced vortex flow?
a) Liquid contained in cylinder rotated about its axis
b) Flow of liquid inside impeller of a centrifugal pump
c) Flow of a water through runner of a turbine
d) Flow of the liquid around a circular bend in a pipe

Explanation: Flow of the liquid around a circular bend in a pipe is an example of free vortex flow.

8. Which of the following is not an example of free vortex flow?
a) Flow of a water through runner of a turbine
b) Flow of liquid through a hole provided at the bottom
c) A whirlpool in a river
d) Flow of the liquid around a circular bend in a pipe

Explanation: Flow of a water through runner of a turbine is an example of forced vortex flow.

9. Equation of motion for vortex flow does not take into account centrifugal force?
a) True
b) False

Explanation: Equation of motion for vortex flow does take into account centrifugal force.

10. Equation of motion for vortex flow does take into account shear force
a) True
b) False

Explanation: Equation of motion for vortex flow does not take into account shear force.

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