Preliminary Treatment(Engineering > Waste Water Engineering ) Questions and Answers

Question 1. Usually while designing what is the range of depth of the aerated grit chamber assumed?
  1.    0.5-2 m
  2.    8-10 m
  3.    2-5 m
  4.    12 m
Explanation:-
Answer: Option C. -> 2-5 m
Answer: (c).2-5 m
Question 2. Aerated grit chambers are usually designed to remove particles in which range of size?
  1.    0.1mm diameter
  2.    0.35 mm diameter
  3.    0.21 mm diameter
  4.    0.41 mm diameter
Explanation:-
Answer: Option C. -> 0.21 mm diameter
Answer: (c).0.21 mm diameter
Question 3. Usually while designing what is the range of length of the aerated grit chamber assumed?
  1.    7.5-20
  2.    4-6 m
  3.    25 m
  4.    50 m
Explanation:-
Answer: Option A. -> 7.5-20
Answer: (a).7.5-20
Question 4. Usually while designing what is the range of the width of the aerated grit chamber assumed?
  1.    0.5-2 m
  2.    8-10 m
  3.    2.5-7.0m
  4.    12m
Explanation:-
Answer: Option C. -> 2.5-7.0m
Answer: (c).2.5-7.0m
Question 5. What is the amount of grit quantities captured by the aerated grit chamber?
  1.    0.004-0.20 m³/10³.m³
  2.    0.25 m³/10³.m³
  3.    <0.004 m³/10³.m³
  4.    0.5 m³/10³.m³
Explanation:-
Answer: Option A. -> 0.004-0.20 m³/10³.m³
Answer: (a).0.004-0.20 m³/10³.m³
Question 6. Which of these screens is used to remove secondary suspended solids?
  1.    Medium drum rotary screen
  2.    Fine drum rotary screen
  3.    Tangential fine screen
  4.    Horizontal reciprocating screen
Explanation:-
Answer: Option B. -> Fine drum rotary screen
Answer: (b).Fine drum rotary screen
Question 7. What is the mathematical representation of hydraulic loses through a screen?
  1.    hL= 1/C(V²/2g)
  2.    hL= 1/C(V²-v²/2g)
  3.    hL= 1/C(V²-v²/g)
  4.    hL= 1/C(V²/g)
Explanation:-
Answer: Option B. -> hL= 1/C(V²-v²/2g)
Answer: (b).hL= 1/C(V²-v²/2g)
Question 8. What is the amount of BOD removed by a fixed parabolic fine screen?
  1.    25-40 %
  2.    40-50%
  3.    5-20%
  4.    30-40%
Explanation:-
Answer: Option C. -> 5-20%
Answer: (c).5-20%
Question 9. How is the headloss for a fine screen calculated?
  1.    hL= 1/2g(Q/CA)²
  2.    hL= 1/g(Q/CA)²
  3.    hL= 1/2g(Q/C)²
  4.    hL= 1/2g(Q/CA)
Explanation:-
Answer: Option A. -> hL= 1/2g(Q/CA)²
Answer: (a).hL= 1/2g(Q/CA)²
Question 10. What is the headloss for fine screens?
  1.    0.8-1.4m
  2.    2-2.5m
  3.    3-3.5m
  4.    <0.8 m
Explanation:-
Answer: Option A. -> 0.8-1.4m
Answer: (a).0.8-1.4m
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