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Test: Boundary Layer Theory - 2 - Mechanical Engineering MCQ


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10 Questions MCQ Test Fluid Mechanics for Mechanical Engineering - Test: Boundary Layer Theory - 2

Test: Boundary Layer Theory - 2 for Mechanical Engineering 2024 is part of Fluid Mechanics for Mechanical Engineering preparation. The Test: Boundary Layer Theory - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Boundary Layer Theory - 2 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Boundary Layer Theory - 2 below.
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Test: Boundary Layer Theory - 2 - Question 1

The maximum thickness of boundary layer in a pipe of radius r is

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 1

The thickness of the boundary layer represented, by 8(greek 'delta’) is arbitrarily defined as that distance from the boundary surface in which the velocity reaches 99% of the velocity of the main stream, in a pipe the free stream velocity is at the centre of the pipe. Therefore maximum thickness of boundary layer is r.

Test: Boundary Layer Theory - 2 - Question 2

The velocity profile for turbulent boundary layer is:

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 2

Velocity profile follows 1/7th power law for turbulent boundary layer.

Test: Boundary Layer Theory - 2 - Question 3

The drag force experienced by an object in a fluid stream is

Test: Boundary Layer Theory - 2 - Question 4

The correct relationship among displacement thickness ‘d’ momentum thickness ‘m’ and energy thickness ‘e’ is

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 4

Displacement thickness,

Momentum thickness,

Energy thickness,

Test: Boundary Layer Theory - 2 - Question 5

What is the momentum thickness for the boundary layer with velocity distribution u/U = y/δ ?

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 5

The momentum thickness is given by,

Test: Boundary Layer Theory - 2 - Question 6

If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as

Test: Boundary Layer Theory - 2 - Question 7

If δ1 and δ2 denote the boundary layer thicknesses at a point distance x from the leading edge on a fiat plate when the Reynolds numbers are 100 and 256 respectively, then the ratio of δ1 to δ2 will be

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 7


Test: Boundary Layer Theory - 2 - Question 8

If δ1 is the thickness of laminar boundary layer at a distance x1 from the leading edge of the flat plate, the thickness δ2 at x2 = 2x1 is equal to

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 8

For laminar boundary layer,

Test: Boundary Layer Theory - 2 - Question 9

The displacement thickness δ* of a boundary layer is defined as δ* =

Detailed Solution for Test: Boundary Layer Theory - 2 - Question 9

Displacement thickness,

Momentum thickness,,

Energy thickness,

Test: Boundary Layer Theory - 2 - Question 10

Separation of boundary layer takes place under

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