Hydrodynamic And Thermal Boundary Layers MCQs

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

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Hydrodynamic And Thermal Boundary Layers MCQs | Page 4 of 5

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Q31.
The transition from laminar to turbulent pattern of flow occurs at values of Reynolds number between

a.

1000-2000

b.

300000-500000

c.

500000-700000

d.

35750-45678

Discuss
Answer: (b).300000-500000
Q32.
The entrance length required for the flow to become fully-developed turbulent flow is dependent on

(i) Surface finish

(ii) Downstream conditions

(iii) Fluid properties

Identify the correct answer

a.

2 and 3

b.

1 and 3

c.

1, 2 and 3

d.

1 and 2

Discuss
Answer: (c).1, 2 and 3
Q33.
What is the value of thickness of the boundary layer at leading edge of the plate?

a.

0.33

b.

1

c.

0.5

d.

0

Discuss
Answer: (d).0
Q34.
The boundary layer thickness is taken to be at a distance from the plate surface to a point at which the velocity is given by

a.

u = 0.99 U INFINITY

b.

u = 0.75 U INFINITY

c.

u = 0.50 U INFINITY

d.

u = 0.33 U INFINITY

Discuss
Answer: (a).u = 0.99 U INFINITY
Q35.
Glycerin at 10 degree Celsius flows past a flat plate at 20 m/s. Workout the velocity components at a point P(x, y) in the fluid flow where

x = 2 m from the leading edge of the plate
y = 5 cm from the plate surface

For glycerin at 10 degree Celsius, kinematic viscosity = 2.79 * 10¯³ m²/s

a.

15.92 m/s and 0.0952 m/s

b.

16.92 m/s and 0.0952 m/s

c.

17.92 m/s and 0.0752 m/s

d.

18.92 m/s and 0.0752 m/s

Discuss
Answer: (b).16.92 m/s and 0.0952 m/s
Q36.
A plate 0.3 m long is placed at zero angle of incidence in a stream of 15 degree Celsius water moving at 1 m/s. Find out the stream wise velocity component at the mid-point of the boundary layer. For water at 15 degree Celsius

p = 998.9 kg /m³
µ = 415.85 * 10¯² kg/hr m

a.

0.736 m/s

b.

0.636 m/s

c.

0.536 m/s

d.

0.436 m/s

Discuss
Answer: (a).0.736 m/s
Q37.
Air at 25 degree Celsius flows over a flat surface with a sharp leading edge at 1.5 m/s. Find the boundary layer thickness at 0.5 from the leading edge. For air at 25 degree Celsius, kinematic viscosity = 15.53* 10n¯⁶ m²/s

a.

4.1376 cm

b.

3.1376 cm

c.

2.1376 cm

d.

1.1376 cm

Discuss
Answer: (d).1.1376 cm
Q38.
Local skin friction coefficient is given by

a.

0.646/ (Re)^1/2

b.

1.646/ (Re)^1/2

c.

2.646/ (Re)^1/2

d.

3.646/ (Re)^1/2

Discuss
Answer: (a).0.646/ (Re)^1/2
Q39.
A plate 0.3 m long is placed at zero angle of incidence in a stream of 15 degree Celsius water moving at 1 m/s. Find out the maximum boundary layer thickness. For water at 15 degree Celsius. For water at 15 degree Celsius

p = 998.9 kg /m³
µ = 415.85 * 10¯² kg/hr m

a.

4.945 m

b.

3.945 m

c.

2.945 m

d.

1.945 m

Discuss
Answer: (c).2.945 m
Q40.
Shear stress at the middle of the plate is given by

a.

T W = 0.964 p U INFINITY²/2 (Re)^1/2

b.

T W = 0.864 p U INFINITY²/2 (Re)^1/2

c.

T W = 0.764 p U INFINITY²/2 (Re)^1/2

d.

T W = 0.664 p U INFINITY²/2 (Re)^1/2.

Discuss
Answer: (d).T W = 0.664 p U INFINITY²/2 (Re)^1/2.
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