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  • Question

  • The time required to close a valve gradually is (where L is the length of pipe and C = velocity of pressure wave)


  • Options
  • A. The time required to close a valve gradually is (where L is the length of pipe and C = velocity of p
  • B. ?The time required to close a valve gradually is (where L is the length of pipe and C = velocity of p
  • C. >The time required to close a valve gradually is (where L is the length of pipe and C = velocity of p
  • D. <The time required to close a valve gradually is (where L is the length of pipe and C = velocity of p

  • Correct Answer
  • > 

    • Hydraulics problems

    Search Results

    • 1. When two layers of a fluid separated by dy move over the other with a difference of velocity dv, causes a shearing stress , where ? is known as

    • Options
    • A. coefficient of viscosity
    • B. absolute viscosity
    • C. dynamic viscosity
    • D. viscosity
    • E. all the above.
      • Discuss
    • 2. The shear stress distribution in viscous fluid through a circular pipe is :

    • Options
    • A. maximum at the centre
    • B. maximum at the inside of surface
    • C. same throughout the section
    • D. none of these.
      • Discuss
    • 3. A pipe consisting of several pipes of varying diameters and lengths, may be replaced by an equivalent pipe of diameter D of length

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. An ideal flow of a liquid obeys

    • Options
    • A. Continuity equation
    • B. Newton's law of viscosity
    • C. Newton's second law of motion
    • D. dynamic viscosity law,
      • Discuss
    • 5. The thickness of a sharp crested weir is kept less than

    • Options
    • A. one-third of the height of water on the sill
    • B. one-half of the height of water on the sill
    • C. one-fourth of the height of water on the sill
    • D. two-third of the height of water on the sill
    • E. none of these.
      • Discuss
    • 6. The diameter (d) of a nozzle fixed at the end of a pipe (diameter D, length L) for maximum energy, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. Reynold number is the ratio of initial force and

    • Options
    • A. viscosity
    • B. elasticity
    • C. gravitational force
    • D. surface tension.
      • Discuss
    • 8. The momentum correction factor (?) for the viscous flow through a circular pipe is

    • Options
    • A. 1.25
    • B. 1.33
    • C. 1.50
    • D. 1.66
    • E. 2.00
      • Discuss
    • 9. If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is

    • Options
    • A. 400 H.P.
    • B. 450 H.P.
    • C. 500 H.P.
    • D. 550 H.P.
      • Discuss
    • 10. The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is

    • Options
    • A. ?
    • B. 2?
    • C. 3?
    • D. 4?
    • E. ?/2
      • Discuss

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