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MCQs

Total Questions : 135 | Page 13 of 14 pages
Question 121. What is the percentage of bacterial removal in filter beds?
  1.    60-70 %
  2.    75-80 %
  3.    80-90 %
  4.    90-99 %
 Discuss Question
Answer: Option D. -> 90-99 %
Answer: (d).90-99 %
Question 122. What is the surface wash rate?
  1.    5-6 cum/sqm h
  2.    6-7 cum/sqm h
  3.    8-10 cum/sqm h
  4.    10-12 cum/sqm h
 Discuss Question
Answer: Option D. -> 10-12 cum/sqm h
Answer: (d).10-12 cum/sqm h
Question 123. What is the effective size of sand used in rapid sand filters?
  1.    0.2-0.3 mm
  2.    0.3-0.6 mm
  3.    0.6-1.2 mm
  4.    12-2.4 mm
 Discuss Question
Answer: Option C. -> 0.6-1.2 mm
Answer: (c).0.6-1.2 mm
Question 124. What is the porosity range during expansion of the filter bed?
  1.    0.4-0.5
  2.    0.5-0.6
  3.    0.1-0.2
  4.    0.68-0.7
 Discuss Question
Answer: Option D. -> 0.68-0.7
Answer: (d).0.68-0.7
Question 125. What is the head loss found in a rapid sand filter?
  1.    <3
  2.    >3
  3.    0
  4.    <4
 Discuss Question
Answer: Option B. -> >3
Answer: (b).>3
Question 126. While designing a multimedia filter what is the velocity that is assumed?
  1.    10-12 m/h
  2.    15-18 m/h
  3.    18-20 m/h
  4.    30 m/h
 Discuss Question
Answer: Option C. -> 18-20 m/h
Answer: (c).18-20 m/h
Question 127. While designing a dual media filter what is the velocity that is assumed?
  1.    10-12 m/h
  2.    15-18 m/h
  3.    20 m/h
  4.    30 m/h
 Discuss Question
Answer: Option B. -> 15-18 m/h
Answer: (b).15-18 m/h
Question 128. While designing a sand filter what is the velocity that is assumed?
  1.    10-12 m/h
  2.    15 m/h
  3.    20 m/h
  4.    30 m/h
 Discuss Question
Answer: Option A. -> 10-12 m/h
Answer: (a).10-12 m/h
Question 129. Calculate the diameter of a sand filter with the following data.
Flow: 2200 m³/hr
Velocity: 12 m/hr
  1.    15.3 m
  2.    15.5 m
  3.    16.3 m
  4.    16.5 m
 Discuss Question
Answer: Option A. -> 15.3 m
Answer: (a).15.3 m
Question 130. Calculate the diameter of a dual media filter with the following data.
Flow: 2200 m³/hr
Velocity: 15 m/hr
  1.    15.5 m
  2.    13.6 m
  3.    13.9 m
  4.    16.5 m
 Discuss Question
Answer: Option B. -> 13.6 m
Answer: (b).13.6 m

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