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JSSC JE (ME) :QUIZ-18 || Boundary-Layer & Forces on Submerged Body

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Question 1

The velocity distribution in a turbulent boundary layer is given by u/U =(y/δ)^1/6. The displacement thickness (δ^*) __________.

Question 2

The thickness of boundary layer for a laminar flow and turbulent flow is given by

Question 3

For the separation of boundary layer, the pressure gradient should be

Question 4

For a laminar flow over a flat plate the boundary layer thickness is equal to 2 mm at a distance of 3 mm form the leading edge. The boundary layer thickness at a distance of 12 mm is equal to _____.

Question 5

Bluff body is the body of such a shape that pressure drag as compared to friction drag is

Question 6

If a thin plate is held parallel to a fluid stream the pressure drag on it is:

Question 7

The shear stress

for steady, fully developed flow inside a uniform horizontal pipe with coefficient of friction f, density p and velocity v, is given by

Question 8

By analyzing the figure, select the statement which is not relevant to it?

Question 9

Consider the following statements regarding turbulent boundary layer on a flat plate with zero pressure gradient:
1) The thickness of the boundary layer increases approximately as the power of the distance from the leading edge.
2) The shear stress at the boundary is approximately inversely proportional to the square root of the local Reynolds number.
Which of these statements is/are correct?

Question 10

Air (density 1.2kg/m³ and kinematic viscosity15 centistokes) flows over a flat plate, at zero angle of incidence, at a velocity of 20 m/s. If Reynolds number at transition is taken as 2.5 × 10⁵, maximum distance, from leading edge up to which the boundary layer remains laminar, is

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AE & JE Exams Mechanical Engineering

Jun 10AE & JE Exams