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Civil Engineering :: Hydraulics and Fluid Mechanics - Civil Engineering

  1. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?

  2. A.

     10 m/sec

    B.

     25 m/sec

    C.

     2 m/sec

    D.

     50 m/sec

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  3. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

  4. A.

     300

    B.

     337.5

    C.

     600

    D.

     675

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  5. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

  6. A.

     force of adhesion

    B.

     force of cohesion

    C.

     force of friction

    D.

     force of diffusion

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  7. The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)

  8. A.

     H/3

    B.

     H/2

    C.

     2 H/5

    D.

     2 H/3

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  9. The line of action of the buoyant force acts through the centroid of the

  10. A.

     submerged body

    B.

     volume of the floating body

    C.

     volume of the fluid vertically above the body

    D.

     displaced volume of the fluid

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  11. Two pipe systems are said to be equivalent when

  12. A.

     head loss and discharge are same in two systems

    B.

     length of pipe and discharge are same in two systems

    C.

     friction factor and length are same in two systems

    D.

     length and diameter are same in two systems

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  13. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

  14. A.

     1 : 5

    B.

     1 : 2.5

    C.

     1 :25

    D.

     1:50

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  15. A fluid is said to be ideal, if it is

  16. A.

     incompressible

    B.

     inviscous

    C.

     inviscous and compressible

    D.

     inviscous and incompressible.

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  17. The horizontal component of force on a curved surface is equal to the

  18. A.

     product of pressure intensity at its centroid and area

    B.

     force on a vertical projection of the curved surface

    C.

     weight of liquid vertically above the curved surface

    D.

     force on the horizontal projection of the curved surface

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  19. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

  20. A.

     1/3 R

    B.

     1/2 R

    C.

     2/3 R

    D.

     3/4 R

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