Hydraulics and Fluid Mechanics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Hydraulics and Fluid Mechanics, a fundamental topic in the field of Mechanical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Hydraulics and Fluid Mechanics 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 Hydraulics and Fluid Mechanics mcq questions that explore various aspects of Hydraulics and Fluid Mechanics problems. Each MCQ is crafted to challenge your understanding of Hydraulics and Fluid Mechanics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Mechanical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Hydraulics and Fluid Mechanics MCQs are your pathway to success in mastering this essential Mechanical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Hydraulics and Fluid Mechanics. 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 Hydraulics and Fluid Mechanics knowledge to the test? Let's get started with our carefully curated MCQs!

Hydraulics and Fluid Mechanics MCQs | Page 6 of 39

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Q51.
The velocity corresponding to Reynold number of 2800, is called

a.

sub-sonic velocity

b.

super-sonic velocity

c.

lower critical velocity

d.

higher critical velocity

Discuss
Answer: (d).higher critical velocity
Q52.
When the pipes are in series, the total head loss is equal to the sum of the head loss in each pipe.

a.

Yes

b.

No

c.

Can't say

d.

None of these

Discuss
Answer: (a).Yes
Q53.
Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.

a.

True

b.

False

c.

Can't say

d.

None of these

Discuss
Answer: (a).True
Q54.
The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)

a.

(H - hf )/H

b.

H/(H - hf )

c.

(H + hf )/H

d.

H/(H + hf )

Discuss
Answer: (a).(H - hf )/H
Q55.
The velocity at which the laminar flow stops, is known as

a.

velocity of approach

b.

lower critical velocity

c.

higher critical velocity

d.

none of these

Discuss
Answer: (b).lower critical velocity
Q56.
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

a.

steady flow

b.

turbulent flow

c.

vortex flow

d.

uniform flow

Discuss
Answer: (c).vortex flow
Q57.
The Newton's law of resistance is based on the assumption that the

a.

planes of the body are completely smooth

b.

space around the body is completely filled with the fluid

c.

fluid particles do not exert any influence on one another

d.

all of the above

Discuss
Answer: (d).all of the above
Q58.
The Euler's equation for the motion of liquids is based upon the assumption that

a.

the fluid is non - viscous, homogeneous and incompressible

b.

the velocity of flow is uniform over the section

c.

the flow is continuous, steady and along the stream line

d.

all of the above

Discuss
Answer: (d).all of the above
Q59.
A weir is usually made of masonry or concrete.

a.

Yes

b.

No

c.

Can't say

d.

None of these

Discuss
Answer: (a).Yes
Q60.
The discharge over a rectangular weir, considering the velocity of approach, is (where H1 = Total height of water above the weir = H + Ha H = Height of water, over the crest of the weir, and Ha = Height of water, due to velocity of approach)

a.

Cd x L2g [H1 - Ha]

b.

Cd x L2g [H13/2 - Ha3/2]

c.

Cd x L2g [H12 - Ha2]

d.

Cd x L2g [H15/2 - Ha5/2]

Discuss
Answer: (b).Cd x L2g [H13/2 - Ha3/2]
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