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MCQs

Total Questions : 103 | Page 6 of 11 pages
Question 51. Which of these process is involved in the settling of particles in the secondary settling tanks?
  1.    Flocculent settling
  2.    Ballasted flocculent settling
  3.    Compression settling
  4.    Hindered settling
 Discuss Question
Answer: Option D. -> Hindered settling
Answer: (d).Hindered settling
Question 52. Which of these process is involved in the removal of chemical flocs?
  1.    Flocculent settling
  2.    Ballasted flocculent settling
  3.    Hindered settling
  4.    Compression settling
 Discuss Question
Answer: Option A. -> Flocculent settling
Answer: (a).Flocculent settling
Question 53. Which of these process is involved in the removal of BOD and phosphorous?
  1.    Flocculent settling
  2.    Accelerated gravity settling
  3.    Ballasted flocculent settling
  4.    Compression settling
 Discuss Question
Answer: Option C. -> Ballasted flocculent settling
Answer: (c).Ballasted flocculent settling
Question 54. How concentrated are the suspensions which are subjected to hindered settling?
  1.    Low
  2.    High
  3.    Very high
  4.    Medium
 Discuss Question
Answer: Option D. -> Medium
Answer: (d).Medium
Question 55. Which of these process is involved in the settling process in solid thickening facilities?
  1.    Compression settling
  2.    Hindered settling
  3.    Accelerated gravity settling
  4.    Flocculent settling
 Discuss Question
Answer: Option A. -> Compression settling
Answer: (a).Compression settling
Question 56. How is the design velocity expressed mathematically for a discrete particle settling process?
  1.    Vc = depth/detention time
  2.    Vc = depth x detention time
  3.    Vc = depth/area
  4.    Vc = area /detention time
 Discuss Question
Answer: Option A. -> Vc = depth/detention time
Answer: (a).Vc = depth/detention time
Question 57. For a discrete particle settling which of these mathematical equations is true?
  1.    Q= A X v
  2.    Q=A/V
  3.    Q= A X t
  4.    Q=A/t
 Discuss Question
Answer: Option A. -> Q= A X v
Answer: (a).Q= A X v
Question 58. Which of these process are involved in the removal of oil and grease?
  1.    Accelerated gravity settling
  2.    Floatation
  3.    Flocculent settling
  4.    Compressed settling
 Discuss Question
Answer: Option B. -> Floatation
Answer: (b).Floatation
Question 59. When will the particles settle in a tank which is subjected to countercurrent settling?
  1.    V<(Vꝋ – V sinƟ)/v cosƟ
  2.    V>= Vꝋ/v cosƟ
  3.    V>= (Vꝋ – V sinƟ)/v cosƟ
  4.    V<Vꝋ/v cosƟ
 Discuss Question
Answer: Option C. -> V>= (Vꝋ – V sinƟ)/v cosƟ
Answer: (c).V>= (Vꝋ – V sinƟ)/v cosƟ
Question 60. How is the length of the surface of a settling tank determined in case of cross- flow settling?
  1.    Lₚ=wVƟ/ v cos Ɵ
  2.    Lₚ<wVƟ/ v cos Ɵ
  3.    Lₚ= (VƟ – V sinƟ)/ v cos Ɵ
  4.    Lₚ<(VƟ – V sinƟ)/ v cos Ɵ
 Discuss Question
Answer: Option A. -> Lₚ=wVƟ/ v cos Ɵ
Answer: (a).Lₚ=wVƟ/ v cos Ɵ

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