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  • Question

  • The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is


  • Options
  • A. 30 minutes
  • B. 1 hour
  • C. 1 hour and 30 minutes
  • D. 2 hours
  • E. 3 hours.

  • Correct Answer
  • 2 hours 

    • More questions

    • 1. Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

    • Options
    • A. 15 days
    • B. 30 days
    • C. 60 days
    • D. 90 days.
      • Discuss
    • 2. If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

    • Options
    • A. square
    • B. rectangular
    • C. trapezoidal
    • D. triangular.
      • Discuss
    • 3. At eastern elongation, the pole star moves

    • Options
    • A. eastward
    • B. westward
    • C. northward
    • D. southward.
      • Discuss
    • 4. For loss of head in a canal inverted syphon barrel, the factor in the Unwin formula is a coefficient for loss of head due to

    • Options
    • A. friction
    • B. exit
    • C. entry
    • D. gradient
      • Discuss
    • 5. The force in AD of the truss shown in given figure, is

    • Options
    • A. 4.0t compression
    • B. 3.0t compression
    • C. 0.5t compression
    • D. 0.5t tension
    • E. zero.
      • Discuss
    • 6. Rapid curing cut back bitumen is produced by blending bitumen with

    • Options
    • A. Kerosene
    • B. Benzene
    • C. Diesel
    • D. Petrol
      • Discuss
    • 7. Fresh sewage is generally

    • Options
    • A. alkaline
    • B. acidic
    • C. highly decomposed
    • D. a source of objectionable odour.
      • Discuss
    • 8. The coefficient ka of the active earth pressure, is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. Pick up the correct statement from the following:

    • Options
    • A. The diameter of a rivet, before driving is taken as the nominal diameter of the rivet
    • B. The diameter of the rivet hole is taken as the gross area of the rivet
    • C. For rivets of nominal diameters less than 25 mm, the diameter of the rivet hole is taken as the nominal diameter of the rivet plus 1.5 mm
    • D. For rivets of nominal diameters exceeding 25 mm, the diameter of the rivet hole is taken as the nominal diameter of the rivet plus 2 mm
    • E. All the above.
      • Discuss
    • 10. Ratio of bearing capacity of double Under Reamed (U.R.) pile to that of single U.R. pile is nearly

    • Options
    • A. 2
    • B. 1.5
    • C. 1.2
    • D. 1.7
      • Discuss

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