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 12 of 39

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Q111.
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.

a.

neutral

b.

stable

c.

unstable

d.

None of these

Discuss
Answer: (a).neutral
Q112.
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

a.

Newton's law of motion

b.

Newton's law of cooling

c.

Newton's law of viscosity

d.

Newton's law of resistance

Discuss
Answer: (d).Newton's law of resistance
Q113.
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

a.

1/2 depth

b.

1/2 breadth

c.

1/2 sloping side

d.

1/4 (depth + breadth)

Discuss
Answer: (a).1/2 depth
Q114.
The velocity corresponding to Reynold number of 2000 is called

a.

sub-sonic velocity

b.

super-sonic velocity

c.

lower critical velocity

d.

higher critical velocity

Discuss
Answer: (c).lower critical velocity
Q115.
The specific weight of water in S.I. units is taken as

a.

9.81 kN/m³

b.

9.81 x 103 kN/m³

c.

9.81 x 10-6 N/mm³

d.

any one of these

Discuss
Answer: (d).any one of these
Q116.
The loss of head at exit of a pipe is

a.

v²/2g

b.

0.5v²/2g

c.

0.375v²/2g

d.

0.75v²/2g

Discuss
Answer: (a).v²/2g
Q117.
The flow in a pipe is laminar, when Reynold number is less than 2000.

a.

True

b.

False

c.

Can't say

d.

None of these

Discuss
Answer: (a).True
Q118.
The power transmitted through the pipe is maximum when the head lost due to friction is equal to

a.

one-fourth of the total supply head

b.

one-third of the total supply head

c.

one-half of the total supply head

d.

two-third of the total supply head

Discuss
Answer: (b).one-third of the total supply head
Q119.
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

a.

Q = Cd x a x 2gh

b.

Q = (2/3). Cd × a × h

c.

Q = (Cd × a)/√(2gh)

d.

Q = (3Cd × a)/√(2h)

Discuss
Answer: (a).Q = Cd x a x 2gh
Q120.
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

a.

equal to

b.

less than

c.

more than

d.

None of these

Discuss
Answer: (c).more than
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