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  • Question

  • A water treatment plant is required to process 28800 m3/d of raw water (density = 1000 kg/m3, kinematic viscosity = 10-6 m2/s). The rapid mixing tank imparts tank a velocity gradient of 900s-1 to blend 35 mg/l of alum with the flow for a detention time of 2 minutes. The power input (W) required for rapid mixing is


  • Options
  • A. 32.4
  • B. 36
  • C. 324
  • D. 32400

  • Correct Answer
  • 32400 

    • More questions

    • 1. For road pavements, the cement generally used, is

    • Options
    • A. ordinary Portland cement
    • B. rapid hardening cement
    • C. low heat cement
    • D. blast furnace slag cement
    • E. none of these.
      • Discuss
    • 2. In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is

    • Options
    • A. right angles
    • B. 45°
    • C. 60°
    • D. parallel
    • E. None of these.
      • Discuss
    • 3. The total area of side face reinforcement, in case of a deep beam should not be less than

    • Options
    • A. 0.1% of web area
    • B. 0.2% of web area
    • C. 0.3% of web area
    • D. 0.4% of web area.
      • Discuss
    • 4. Most commonly used section in grade aqueducts, is

    • Options
    • A. circular
    • B. rectangular
    • C. parabolic
    • D. horse shoe section.
      • Discuss
    • 5. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

    • Options
    • A. 1.5
    • B. 2.0
    • C. 2.5
    • D. 3.0
    • E. 3.5
      • Discuss
    • 6. An angle of deflection right, may be directly obtained by setting the instrument to read

    • Options
    • A. zero on back station
    • B. 180° on back station
    • C. 90°
    • D. 270° on back station.
      • Discuss
    • 7. Pick up the incorrect statement from the following:

    • Options
    • A. Lead is the average horizontal straight distance between the borrow pit and the place of spreading soil
    • B. The lead is calculated for each block of the excavated area
    • C. The unit of lead is 50 m for a distance upto 500 m
    • D. The unit of lead is 1 km where the lead exceeds 2 km.
      • Discuss
    • 8. The bearing of C from A is N 30° E and from B, 50 metres east of A, is N 60° W. The departure of C from A is

    • Options
    • A. 50 m
    • B. 50 3 m
    • C. 25 3 m
    • D. 25 m
      • Discuss
    • 9. The heaviest line is used to democrate

    • Options
    • A. the low water line
    • B. the high water line
    • C. the limit of swamps
    • D. the direction of current.
      • Discuss
    • 10. Pick up the correct statement from the following:

    • Options
    • A. The artificial barrier constructed to enclose "n area for safe anchorage, is called break water
    • B. The smoothened surface at the top end of the vertical face of a guay wall, is called fending
    • C. The effective berthing lengths of inclined guays can be adjusted
    • D. All the above.
      • Discuss

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