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  • Question

  • Flow in pipes is laminar if Reynold number is


  • Options
  • A. less than 2100
  • B. more than 3000
  • C. between 2100 and 3000
  • D. none of these.

  • Correct Answer
  • less than 2100 

    • Hydraulics problems

    Search Results

    • 1. Total head of a liquid particle in motion is the sum of

    • Options
    • A. potential head and kinetic head
    • B. kinetic head and pressure head
    • C. potential head and pressure head
    • D. potential head, kinetic head and pressure head.
      • Discuss
    • 2. If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30°, the time to reach the highest point is

    • Options
    • A. 0.25 s
    • B. 0.50 s
    • C. 1.0 s
    • D. 1.5 s.
      • Discuss
    • 3. If Re is the Renold's number, the coefficient of friction for laminar flow is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. An orifice is taken as large if

    • Options
    • A. (H2 - H1) > H
    • B. (H2 - H1) > H/4
    • C. (H2 - H1) > H/2
    • D. (H2 - H1) > H/3
      • Discuss
    • 5. A cylinder 3 m in diameter and 4 m long retains water one side as shown in the below figure. If the weight of the cylinder is 2000 kgf, the vertical reaction at A is

    • Options
    • A. 14,137 kgf
    • B. 5,863 kgf
    • C. 20,000 kgf
    • D. 18,000 kgf.
      • Discuss
    • 6. The mouth piece shown in the below figure is generally known as

    • Options
    • A. Internal mouth piece
    • B. Re-entrant mouth piece
    • C. Borda's mouth piece
    • D. All the above.
      • Discuss
    • 7. The continuity equation

    • Options
    • A. expresses the relationship between work and energy
    • B. relates the momentum per unit volume between two points on a stream line
    • C. relates mass rate of flow along a stream line
    • D. requires that Newton's second law of motion be satisfied at every point in fluid.
      • Discuss
    • 8. If S is the length of the crest, H is the height of water source of a weir whose length is L and discharge is Q m3/sec, the velocity of approach Vd is

    • Options
    • A. 2gH
    • B.
    • C.
    • D.
    • E. none of these.
      • Discuss
    • 9. The length of pipe is L, velocity of flow of a liquid in the pipe is V. If t is the time in second required to close the valve, the head of pressure

    • Options
    • A.
    • B.
    • C.
    • D. none of these.
      • Discuss
    • 10. In fluids, steady flow occurs when

    • Options
    • A. conditions of flow change steadily with time
    • B. conditions of flow do not change with time at a point
    • C. conditions of flow remain the same at adjacent point
    • D. velocity vector remains constant at a point.
      • Discuss

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