Fluid Mechanics MCQs

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

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

Fluid Mechanics MCQs | Page 7 of 77

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Q61.
Head developed by a centrifugal pump depends on its

a.

speed

b.

impeller diameter

c.

both (a) and (b)

d.

neither (a) nor (b)

Discuss
Answer: (c).both (a) and (b)
Q62.
Hydraulic mean depth (Dโ‚˜) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dโ‚˜ = 0.3 D, gives the condition for the maximum

a.

flow rate

b.

mean velocity

c.

both 'a' & 'b'

d.

neither 'a' nor 'b'

Discuss
Answer: (b).mean velocity
Q63.
The head loss in turbulent flow in a pipe varies

a.

as velocity

b.

as (velocity)²

c.

inversely as the square of diameter

d.

inversely as the velocity

Discuss
Answer: (b).as (velocity)²
Q64.
Most commonly used joint in the underground pipe lines is the

a.

sleevejoint

b.

coupling

c.

flange

d.

expansion joint

Discuss
Answer: (a).sleevejoint
Q65.
Schedule number of a pipe, which is a measure of its wall thickness, is given by

a.

1000 P'/S

b.

100 P'/S

c.

1000 S/P'

d.

10000 P'/S

Discuss
Answer: (a).1000 P'/S
Q66.
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the

a.

discharge.

b.

suction.

c.

suction minus vapor pressure of the liquid at suction temperature.

d.

discharge minus vapor pressure of the liquid at the discharge temperature.

Discuss
Answer: (c).suction minus vapor pressure of the liquid at suction temperature.
Q67.
For a particle settling in water at its terminal settling velocity, which of the following is true ?

a.

Buoyancy = weight + drag

b.

Weight = buoyancy + drag

c.

Drag = buoyancy + weight

d.

Drag = weight

Discuss
Answer: (b).Weight = buoyancy + drag
Q68.
A Bingham fluid of viscosity ฮผ = 10 Pa.s and yield stress, ฯ„โ‚€ = 10 KPa, is shared between flat parallel plates separated by a distance of 10โป³ m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is

a.

10 KPa

b.

20 KPa

c.

30 KPa

d.

40 KPa

Discuss
Answer: (b).20 KPa
Q69.
Pick out the correct statement.

a.

A forced vortex occurs when fluid rotates as a solid about an axis.

b.

In laminar flow, Newton's law of viscosity does not apply.

c.

A free vortex occurs, when fluidrotates as a solid.

d.

In turbulent flow, there are neither cross-currents nor eddies.

Discuss
Answer: (a).A forced vortex occurs when fluid rotates as a solid about an axis.
Q70.
Shear stress in a fluid flowing in a round pipe

a.

varies parabolically across the cross-section.

b.

remains constant over the cross-section.

c.

is zero at the centre and varies linearly with the radius.

d.

is zero at the wall and increases linearly to the centre.

Discuss
Answer: (c).is zero at the centre and varies linearly with the radius.
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