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 5 of 39

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Q41.
According to equation of continuity,

a.

w1a1 = w2a2

b.

w1v1 = w2v2

c.

a1v1 = a2v2

d.

a1/v1 = a2/v2

Discuss
Answer: (c).a1v1 = a2v2
Q42.
Coefficient of resistance is the ratio of

a.

actual velocity of jet at vena contracta to the theoretical velocity

b.

area of jet at vena contracta to the area of orifice

c.

loss of head in the orifice to the head of water available at the exit of the orifice

d.

actual discharge through an orifice to the dieoretical discharge

Discuss
Answer: (c).loss of head in the orifice to the head of water available at the exit of the orifice
Q43.
In order to measure the flow with a venturimeter, it is installed in

a.

horizontal line

b.

inclined line with flow upwards

c.

inclined line with flow downwards

d.

any direction and in any location

Discuss
Answer: (d).any direction and in any location
Q44.
The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

a.

Q = Cd x b2g(H2 - H1)

b.

Q = Cd x b2g(H21/2 - H11/2)

c.

Q = (2/3) Cd × b × √(2g) × (H23/2 - H13/2)

d.

Q = Cd x b2g(H22 - H12)

Discuss
Answer: (c).Q = (2/3) Cd × b × √(2g) × (H23/2 - H13/2)
Q45.
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy 's coefficient of friction for pipe, and l = Length of pipe )

a.

d = (D⁵/8fl)1/2

b.

d = (D⁵/8fl)1/3

c.

d = (D⁵/8fl)1/4

d.

d = (D⁵/8fl)1/5

Discuss
Answer: (c).d = (D⁵/8fl)1/4
Q46.
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

a.

Cd 2g x H

b.

Cd 2g x H3/2

c.

Cd 2g x H2

d.

Cd 2g x H5/2

Discuss
Answer: (d).Cd 2g x H5/2
Q47.
A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

a.

equal to.

b.

less than

c.

more than

d.

None of these

Discuss
Answer: (c).more than
Q48.
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

a.

wH

b.

wH/2

c.

wH2/2

d.

wH2/3

Discuss
Answer: (c).wH2/2
Q49.
An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch.

a.

1%

b.

1.5%

c.

2%

d.

2.5%

Discuss
Answer: (d).2.5%
Q50.
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by

a.

l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²)

b.

l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³)

c.

l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴)

d.

l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)

Discuss
Answer: (d).l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)
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