Fluid Mechanics And Hydraulics

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| By Bhaskargeo
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Bhaskargeo
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Quizzes Created: 1 | Total Attempts: 468
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  • 1/6 Questions

    Drag force is a function of

    • Projected area of the body
    • Mass density of the fluid
    • Velocity of the body
    • The correct answer is A, B and C
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About This Quiz

This quiz covers key aspects of fluid mechanics and hydraulics, focusing on boundary layers, drag force, and scale modeling in fluid dynamics.

Fluid Mechanics And Hydraulics - Quiz

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  • 2. 

    The displacement thickness of a boundary layer is

    • The distance to the point where (v/V) = 0.99

    • The distance where the velocity 'v' is equal to the shear velocity V*, that is, where v=V*

    • The distance by which the main flow is to be shifted from the boundary to maintain the continuity equation

    • One half the actual thickness of the boundary layer

    Correct Answer
    A. The distance by which the main flow is to be shifted from the boundary to maintain the continuity equation
    Explanation
    The displacement thickness of a boundary layer refers to the distance by which the main flow is to be shifted from the boundary in order to maintain the continuity equation. This means that in order to account for the boundary layer, the main flow needs to be shifted by a certain distance to ensure that the mass flow rate remains constant. This displacement thickness is necessary to accurately analyze and calculate the flow properties within the boundary layer region.

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  • 3. 

    Apart form inertia force, which of the following forces is most important in motion of submarines under water?

    • Viscous force

    • Gravity force

    • Compressive force

    • Surface tension force

    Correct Answer
    A. Viscous force
    Explanation
    Viscous force is the most important force in the motion of submarines underwater because water is a viscous fluid. Viscous force is the resistance offered by the fluid to the motion of an object through it. In the case of submarines, the shape and design of the submarine are crucial in order to minimize the drag caused by viscous forces. By reducing the drag, the submarine can move more efficiently through the water, allowing for better control and maneuverability. Therefore, understanding and managing viscous forces is essential for the effective operation of submarines underwater.

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  • 4. 

    A spillway model constructed to a scale of 1:4 gives a discharge of 5 m3/s.   The discharge from the prototype would be  

    • 160 m3/s

    • 640 m3/s

    • 10 m3/s

    • 20 m3/s

    Correct Answer
    A. 160 m3/s
    Explanation
    A spillway model constructed to a scale of 1:4 gives a discharge of 5 m3/s. Since the scale of the model is 1:4, it means that every 1 unit in the model represents 4 units in the prototype. Therefore, to find the discharge from the prototype, we need to multiply the discharge from the model by the scale factor (4). 5 m3/s multiplied by 4 equals 20 m3/s. Therefore, the correct answer is 20 m3/s.

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  • 5. 

    A river model is made to a length scale ratio of 1/100 and depth scale ratio of 1/16.  A peak discharge of 25,600 m3/s in the river will be simulated in the model with a discharge of

    • 10 cumec.

    • 4 cumec.

    • 1.6 cumec.

    • 0.64 cumec.

    Correct Answer
    A. 4 cumec.
    Explanation
    In a river model, the length scale ratio is 1/100 and the depth scale ratio is 1/16. This means that every unit of length in the model represents 100 units of length in the actual river, and every unit of depth in the model represents 16 units of depth in the actual river.

    To determine the discharge in the model, we need to consider the ratio of the cross-sectional areas of the model and the actual river. Since the length scale ratio is 1/100 and the depth scale ratio is 1/16, the area scale ratio is (1/100) * (1/16) = 1/1600.

    Given that the peak discharge in the actual river is 25,600 m3/s, the discharge in the model can be calculated by multiplying the peak discharge by the area scale ratio: 25,600 * (1/1600) = 16 cumec.

    Therefore, the correct answer is 4 cumec.

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  • 6. 

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

    • D>m>e

    • D>e>m

    • E>m>d

    • E>d>m

    Correct Answer
    A. E>d>m
    Explanation
    The correct relationship among displacement thickness (d), momentum thickness (m), and energy thickness (e) is that the energy thickness (e) is greater than the displacement thickness (d), and the displacement thickness (d) is greater than the momentum thickness (m). This means that the energy thickness represents the largest contribution to the total boundary layer thickness, followed by the displacement thickness, and finally the momentum thickness.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 08, 2009
    Quiz Created by
    Bhaskargeo
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