Test: Boundary Layer Theory - 1 - Civil Engineering (CE) MCQ

# Test: Boundary Layer Theory - 1 - Civil Engineering (CE) MCQ

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## 10 Questions MCQ Test GATE Civil Engineering (CE) 2024 Mock Test Series - Test: Boundary Layer Theory - 1

Test: Boundary Layer Theory - 1 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2024 Mock Test Series preparation. The Test: Boundary Layer Theory - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Boundary Layer Theory - 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Boundary Layer Theory - 1 below.
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Test: Boundary Layer Theory - 1 - Question 1

### A fluid with kinematic viscosity v flows in laminar stage along a flat plate with free-stream velocity V. At a distance x from the leading edge, the Reynolds number of the flow is given by R = Vx/v. The thickness of the boundary layer at x will be proportional to

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

Test: Boundary Layer Theory - 1 - Question 2

### Magnus effect may be used advantageously in games such as cricket, tennis, table tennis and golf. In order to obtain a lift, i.e. a rising curve for the trajectory of the ball, from left to right, the nature of the spin to be given is

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

For rising curve, lift force in the vertical plane is needed. So for lift to right trajectory clockwise rotation should be given in horizontal plane.

Test: Boundary Layer Theory - 1 - Question 3

### Match List - I with List - ll and select the correct answer using the codes given below the lists:

Detailed Solution for Test: Boundary Layer Theory - 1 - Question 3

The point of separation is defined as the limit between forward arid reverse flow in the layer very close to the wall,
The minimum pressure occur little upstream of stagnation point.

Test: Boundary Layer Theory - 1 - Question 4

A thin smooth plate 1 m wide and 2 m long is towed through water at a velocity of 2 m/s. Assuming that boundary remains laminar, then drag on both sides of the plate is (kinematic viscosity = 10-6 m2/s)

Detailed Solution for Test: Boundary Layer Theory - 1 - Question 4

The drag force on both sides of the plate,

Test: Boundary Layer Theory - 1 - Question 5

For a turbulent boundary layer (under zero pressure gradient), the velocity profile is described by the one-fifth power law. What is the ratio of displacement thickness to boundary layer thickness?

Detailed Solution for Test: Boundary Layer Theory - 1 - Question 5

δ is boundary layer thickness
δ* is displacement thickness
θ is momentum thickness Shape factor,

Test: Boundary Layer Theory - 1 - Question 6

The velocity distribution for flow over a plate is given by u = 0.5y - y2 where ‘u’ is the velocity in m/s at a distance ‘y’ meter above the plate. If the dynamic viscosity of the fluid is 0.9 N-s/m2, then what is the shear stress at 0.20 m from the boundary?

Detailed Solution for Test: Boundary Layer Theory - 1 - Question 6

Shear stress τ =  = μ (0.5 - 2y)
at y = 0.2 m,
τ = 0.9 x (05 - 2 x 0.2) = 0.09 N/m2

Test: Boundary Layer Theory - 1 - Question 7

In the case of a sphere placed in a fluid stream

Detailed Solution for Test: Boundary Layer Theory - 1 - Question 7

For a well streamlined body the separation occurs only at the downstream end. As such the wake in this case is extremely small. Flence the pressure drag of such objects is very small fraction of that of the disc. However, the frictional drag of streamlined bodies is considerably large than that of the sphere, since there being more surface area in contact with the flow. Furthermore, for well streamlined objects friction drag is usually larger than pressure drag, but both are so small that their total drag is only about one-fortieth (1/40) of that of the disc.

Test: Boundary Layer Theory - 1 - Question 8

A very tiny sphere is settling down in a viscous liquid at Reynold’s number = 0.2. Its drag coefficient will be

Detailed Solution for Test: Boundary Layer Theory - 1 - Question 8

CD = 24/Re = 24/0.2 = 120

Test: Boundary Layer Theory - 1 - Question 9

According to Prandtl-Blassius relation, the thickness of boundary layer in turbulent flow is
where x = distance between leading edge of the body and the section where thickness of boundary layer is required.
Rex = Reynold’s number at a distance x from the leading edge.

Test: Boundary Layer Theory - 1 - Question 10

In which of the following the friction drag is generally larger than pressure drag?

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## GATE Civil Engineering (CE) 2024 Mock Test Series

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