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MCQs

Total Questions : 181 | Page 3 of 19 pages
Question 21. When the Reynolds number is greater than 1.9 but less than 500, the coefficient of drag CD is?
  1.    CD = 24/R
  2.    CD = R/24
  3.    CD = 18.5/R⁰·⁶
  4.    CD = R⁰·⁶/18.5
 Discuss Question
Answer: Option C. -> CD = 18.5/R⁰·⁶
Answer: (c).CD = 18.5/R⁰·⁶
Question 22. The superficial velocity in a stratified bed is equal to __________
  1.    Terminal settling velocity
  2.    Terminal settling velocity * porosity
  3.    Terminal settling velocity * (porosity)²
  4.    Terminal settling velocity * (porosity)⁴·⁵
 Discuss Question
Answer: Option D. -> Terminal settling velocity * (porosity)⁴·⁵
Answer: (d).Terminal settling velocity * (porosity)⁴·⁵
Question 23. Rose equation is valid for beds in which voids are clear and unobstructed.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 24. When does the particle become suspended in an expanded bed?
  1.    When superficial velocity is greater than critical velocity
  2.    When superficial velocity is less than critical velocity
  3.    When superficial velocity is equal to critical velocity
  4.    When superficial velocity is constant
 Discuss Question
Answer: Option C. -> When superficial velocity is equal to critical velocity
Answer: (c).When superficial velocity is equal to critical velocity
Question 25. The value of Reynolds number R is 1.5. The coefficient of drag is?
  1.    8
  2.    10
  3.    12
  4.    16
 Discuss Question
Answer: Option D. -> 16
Answer: (d).16
Question 26. Consider the following statements regarding pressure filter.
i. It is easy to inspect the under drainage system
ii. It is not possible to provide time for chlorination in direct supply from it
iii. It is not possible to observe the degree of back washing and the agitation process
Which of the above statement is correct?
  1.    i only
  2.    ii, iii
  3.    i, ii, iii
  4.    i, iii
 Discuss Question
Answer: Option B. -> ii, iii
Answer: (b).ii, iii
Question 27. In which of the following filter, two layers filtering media is provided for filtration?
  1.    Slow sand filter
  2.    Pressure filter
  3.    Rapid sand filter
  4.    Dual media filter
 Discuss Question
Answer: Option D. -> Dual media filter
Answer: (d).Dual media filter
Question 28. The rate of filtration of pressure filtration is ______ l/m²/hour.
  1.    1000-5000
  2.    5000-10000
  3.    6000-8000
  4.    6000-15000
 Discuss Question
Answer: Option D. -> 6000-15000
Answer: (d).6000-15000
Question 29. What is the specific gravity of Anthracite used in a dual media filter?
  1.    1
  2.    1.4
  3.    2.4
  4.    4.2
 Discuss Question
Answer: Option B. -> 1.4
Answer: (b).1.4
Question 30. What is the size of sand used in a dual media filter?
  1.    0.5-1mm
  2.    1-2mm
  3.    2-3mm
  4.    3.5-4mm
 Discuss Question
Answer: Option A. -> 0.5-1mm
Answer: (a).0.5-1mm

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