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MCQs

Total Questions : 181 | Page 5 of 19 pages
Question 41. What is the dimension formula of mean velocity gradient?
  1.    1/T
  2.    1/T²
  3.    T
  4.    T²
 Discuss Question
Answer: Option A. -> 1/T
Answer: (a).1/T
Question 42. What is the desirable value of mean velocity gradient in a flocculator?
  1.    20-50sec⁻¹
  2.    20-75sec⁻¹
  3.    50-100sec⁻¹
  4.    30-50sec⁻¹
 Discuss Question
Answer: Option B. -> 20-75sec⁻¹
Answer: (b).20-75sec⁻¹
Question 43. What is the normal value of the detention period adopted in a flocculator for design purpose?
  1.    30min
  2.    60min
  3.    90min
  4.    100min
 Discuss Question
Answer: Option A. -> 30min
Answer: (a).30min
Question 44. The design value of the velocity of flow in a flocculator is _______
  1.    0.2-0.8m/s
  2.    0.3-0.5m/s
  3.    0.6-0.8m/s
  4.    0.1-0.5m/s
 Discuss Question
Answer: Option A. -> 0.2-0.8m/s
Answer: (a).0.2-0.8m/s
Question 45. What is the detention period of a clarifier used in the treatment of water?
  1.    1hour
  2.    2hours
  3.    3hours
  4.    4hours
 Discuss Question
Answer: Option C. -> 3hours
Answer: (c).3hours
Question 46. Which of the following is not commonly used as a filter material in the treatment of water?
  1.    Sand
  2.    Anthracite
  3.    Crushed rock
  4.    Garnet sand
 Discuss Question
Answer: Option C. -> Crushed rock
Answer: (c).Crushed rock
Question 47. The uniformity characteristics of sand expressed in terms of __________
  1.    Effective size
  2.    Effective size and uniformity coefficient
  3.    Uniformity coefficient
  4.    Mean velocity
 Discuss Question
Answer: Option B. -> Effective size and uniformity coefficient
Answer: (b).Effective size and uniformity coefficient
Question 48. Consider the following statements regarding sand as filter material.
i. It should be free from clay or silt
ii. Organic matter should be present in the sand
iii. It should be nonuniform
Which of the above statement is/are correct?
  1.    i, ii
  2.    i only
  3.    ii, iii
  4.    i, ii, iii
 Discuss Question
Answer: Option B. -> i only
Answer: (b).i only
Question 49. ____ represents the size of sand particle such that 10% of particles are finer than this size.
  1.    D₀ꓸ₁
  2.    D₁
  3.    D₁₀
  4.    D₁₀₀
 Discuss Question
Answer: Option C. -> D₁₀
Answer: (c).D₁₀
Question 50. Which of the following is correct regarding the cheapest filter material used in water treatment?
  1.    Sand>Anthracite>Garnet sand
  2.    Sand<Anthracite>Garnet sand
  3.    Sand<Anthracite<Garnet sand
  4.    Sand=Anthracite>Garnet sand
 Discuss Question
Answer: Option A. -> Sand>Anthracite>Garnet sand
Answer: (a).Sand>Anthracite>Garnet sand

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