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MCQs

Total Questions : 129 | Page 8 of 13 pages
Question 71. Which of the following has a minimum detention period?
  1.    Sludge digestion tank
  2.    Primary sedimentation
  3.    Skimming tank
  4.    Oxidation pond
 Discuss Question
Answer: Option C. -> Skimming tank
Answer: (c).Skimming tank
Question 72. The coefficient of drag for a transition settling is ____________
  1.    CD = 18.5/R⁰·⁶
  2.    CD = 24/R
  3.    CD = 8.5/R⁰·⁶
  4.    CD = R/24
 Discuss Question
Answer: Option A. -> CD = 18.5/R⁰·⁶
Answer: (a).CD = 18.5/R⁰·⁶
Question 73. In which of the following, large impurities are attached with air bubbles to remove it from the wastewater?
  1.    Sludge digestion tank
  2.    Primary sedimentation
  3.    Vacuum floatation
  4.    Oxidation pond
 Discuss Question
Answer: Option C. -> Vacuum floatation
Answer: (c).Vacuum floatation
Question 74. The dimension formula of dynamic viscosity is ____________
  1.    ML⁻¹T
  2.    ML⁻¹T⁻¹
  3.    ML⁻²T⁻²
  4.    ML⁻¹T⁻³
 Discuss Question
Answer: Option B. -> ML⁻¹T⁻¹
Answer: (b).ML⁻¹T⁻¹
Question 75. The dimension formula of kinematic viscosity is ____________
  1.    L⁻¹T
  2.    ML⁻¹T⁻¹
  3.    ML⁻²T⁻²
  4.    L²T⁻¹
 Discuss Question
Answer: Option D. -> L²T⁻¹
Answer: (d).L²T⁻¹
Question 76. The design velocity of flow of a detritus tank is ____________
  1.    1m/Sec
  2.    1.2m/Sec
  3.    0.9m/Sec
  4.    0.5m/Sec
 Discuss Question
Answer: Option C. -> 0.9m/Sec
Answer: (c).0.9m/Sec
Question 77. Which of the following device is used for the removal of oil and grease?
  1.    Skimming tank
  2.    Grit chambers
  3.    Tube settlers
  4.    Flocculator
 Discuss Question
Answer: Option A. -> Skimming tank
Answer: (a).Skimming tank
Question 78. The detention period of detritus tank is ____________
  1.    40 seconds
  2.    1 minute
  3.    3 minute
  4.    1 hour
 Discuss Question
Answer: Option C. -> 3 minute
Answer: (c).3 minute
Question 79. A pressure difference of _____________ is applied to the vacuum floatation method to remove impurities from sewage.
  1.    0.5 atm
  2.    1 atm
  3.    1.5 atm
  4.    2 atm
 Discuss Question
Answer: Option B. -> 1 atm
Answer: (b).1 atm
Question 80. ________ is used to find the D.O content of sewage.
  1.    Winkler method
  2.    Chromatography
  3.    Kjeldahl method
  4.    Olfactometer
 Discuss Question
Answer: Option B. -> Chromatography
Answer: (b).Chromatography

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