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MCQs

Total Questions : 76 | Page 5 of 8 pages
Question 41. _________ is the actual mass of oxygen transferred per unit time.
  1.    OTR
  2.    SOTR
  3.    OTE
  4.    SOTE
 Discuss Question
Answer: Option A. -> OTR
Answer: (a).OTR
Question 42. Which of the following is not used for iron removal?
  1.    Oxidation
  2.    Reduction
  3.    Gasification
  4.    Absorption
 Discuss Question
Answer: Option B. -> Reduction
Answer: (b).Reduction
Question 43. What is the range of pH above which aeration is required?
  1.    2 mg/L
  2.    5 mg/L
  3.    8 mg/L
  4.    10 mg/L
 Discuss Question
Answer: Option D. -> 10 mg/L
Answer: (d).10 mg/L
Question 44. H₂S is highly soluble in water.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 45. High solubility of CO₂ ______ pH.
  1.    Maintains
  2.    Reduces
  3.    Increases
  4.    Nullifies
 Discuss Question
Answer: Option B. -> Reduces
Answer: (b).Reduces
Question 46. How many types of aerators are present?
  1.    2
  2.    3
  3.    4
  4.    5
 Discuss Question
Answer: Option C. -> 4
Answer: (c).4
Question 47. Calculate the theoretical oxygen requirement for the following details.
Flow: 200 m³/h
BOD load: 800 mg/L
  1.    45.5 Kg/h of O₂/hr
  2.    23.05 Kg/h of O₂/hr
  3.    25.05 Kg/h of O₂/hr
  4.    50.5 Kg/h of O₂/hr
 Discuss Question
Answer: Option B. -> 23.05 Kg/h of O₂/hr
Answer: (b).23.05 Kg/h of O₂/hr
Question 48. Calculate the amount of air required for the following details.
Flow: 300 m³/h
BOD load: 800 mg/L
  1.    550 m³/hr
  2.    518 m³/hr
  3.    700m³/hr
  4.    618 m³/hr
 Discuss Question
Answer: Option C. -> 700m³/hr
Answer: (c).700m³/hr
Question 49. Calculate the number of diffusers for the following.
Blower Flow rate: 535 m³/hr
Coarse diffusers are used.
  1.    54
  2.    60
  3.    65
  4.    70
 Discuss Question
Answer: Option A. -> 54
Answer: (a).54
Question 50. Calculate the number of fine diffusers required for the following data.
Flow: 300 m³/h
BOD load: 1000 mg/L
  1.    150
  2.    146
  3.    170
  4.    186
 Discuss Question
Answer: Option B. -> 146
Answer: (b).146

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