Viscous Flow and Turbulent Flow MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Viscous Flow and Turbulent Flow, a fundamental topic in the field of Fluid Mechanics. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Viscous Flow and Turbulent Flow MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Viscous Flow and Turbulent Flow mcq questions that explore various aspects of Viscous Flow and Turbulent Flow problems. Each MCQ is crafted to challenge your understanding of Viscous Flow and Turbulent Flow principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Fluid Mechanics tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Viscous Flow and Turbulent Flow MCQs are your pathway to success in mastering this essential Fluid Mechanics topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Viscous Flow and Turbulent Flow. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Viscous Flow and Turbulent Flow knowledge to the test? Let's get started with our carefully curated MCQs!

Viscous Flow and Turbulent Flow MCQs | Page 2 of 9

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Q11.
For a fully-developed pipe flow, how does the pressure vary with the length of the pipe?

a.

Linearly

b.

Parabolic

c.

Exponential

d.

Constant

Discuss
Answer: (a).Linearly
Q12.
When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?

a.

RMS velocity

b.

Average velocity

c.

Absolute velocity

d.

Relative velocity

Discuss
Answer: (b).Average velocity
Q13.
Which of the factors primarily decide whether the flow in a circular pipe is laminar or turbulent?

a.

The Prandtl Number

b.

The Pressure gradient along the length of the pipe

c.

The dynamic viscosity coefficient

d.

The Reynolds Number

Discuss
Answer: (d).The Reynolds Number
Q14.
How is Reynolds number defined as?

a.

Ratio of pressures in the inlet to the outlet of a pipe

b.

The product of velocity of the flow and the diameter of the pipe, divided by the kinematic viscosity of fluid

c.

The product of density of the fluid, velocity of the flow and the diameter of the pipe, divided by the dynamic viscosity of fluid

d.

Ratio of inertia force to viscous force

Discuss
Answer: (d).Ratio of inertia force to viscous force
Q15.
A circular pipe of radius 7 cm is used for water flow transmission. This pipe is moulded into another pipe with a square cross-section keeping the length same. (Ignore the thickness of the pipe). Calculate the hydraulic diameter of the moulded pipe. (Take π = 22/7).

a.

11 cm

b.

7 cm

c.

3.5 cm

d.

22 cm

Discuss
Answer: (a).11 cm
Q16.
Water flows through a circular tube with a velocity of 2 m/s. The diameter of the pipe is 14 cm. Take kinematic viscosity of water 10⁻⁶ m²/s and density of water 1000 kg/m³.

a.

2.8*10⁸

b.

2.8*10⁵

c.

2800

d.

28000

Discuss
Answer: (b).2.8*10⁵
Q17.
The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by __________

a.

57% decrease

b.

57% increase

c.

43% decrease

d.

43% increase

Discuss
Answer: (b).57% increase
Q18.
The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?

a.

The flow will become turbulent

b.

The flow will be a transition flow

c.

The flow will remain laminar

d.

The Reynolds number of the earlier flow is required to answer this question

Discuss
Answer: (c).The flow will remain laminar
Q19.
What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10⁻⁶) to be laminar in nature? Assume Lower critical Reynolds number to be 2100.

a.

2.1 mm

b.

21 mm

c.

21 cm

d.

0.21 mm

Discuss
Answer: (a).2.1 mm
Q20.
Which of the following flows have the highest critical Reynolds number (lower)?

a.

Flow in a pipe

b.

Flow between parallel plates

c.

Flow in an open channel

d.

Flow around spherical body

Discuss
Answer: (a).Flow in a pipe
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