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MCQs

Total Questions : 88 | Page 4 of 9 pages
Question 31. The longer the water is held in the tank, the better the treatment.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 32. ______ allow the water to soak into the ground.
  1.    Septic tank
  2.    Trenches
  3.    Effluent pipe
  4.    Evapo-transpiration
 Discuss Question
Answer: Option B. -> Trenches
Answer: (b).Trenches
Question 33. Large amount of wastewater constantly produced _________ the treatment time of wastewater in a septic tank.
  1.    Increase
  2.    Shorten
  3.    Does not alter
  4.    Affects
 Discuss Question
Answer: Option B. -> Shorten
Answer: (b).Shorten
Question 34. What is the common effluent pipe from each house to a collection point called?
  1.    CID
  2.    CED
  3.    CSD
  4.    CCD
 Discuss Question
Answer: Option B. -> CED
Answer: (b).CED
Question 35. ______ is called effluent.
  1.    Water
  2.    Untreated wastewater
  3.    Treated wastewater
  4.    Untreated water
 Discuss Question
Answer: Option C. -> Treated wastewater
Answer: (c).Treated wastewater
Question 36. What is the range of charge present on bentonite?
  1.    20-30 meq/gram
  2.    30-40 meq/gram
  3.    40-60 meq/gram
  4.    70-90 meq/gram
 Discuss Question
Answer: Option D. -> 70-90 meq/gram
Answer: (d).70-90 meq/gram
Question 37. Compute the required pressure for the flotation thickener without recycle for the following information:
A/S = 0.008 mL/mg
Temperature: 20 degree Celsius
Air solubility: 18.7 mL/L
Recycle steam pressure: 275 kPa
Fraction of saturation: 0.5
Surface Loading rate: 8 L/m²/min
Sludge flow rate: 400 m³/d
  1.    302 kPa
  2.    640 kPa
  3.    380 kPa
  4.    680 kPa
 Discuss Question
Answer: Option A. -> 302 kPa
Answer: (a).302 kPa
Question 38. The design of oil/water separators is based on _________
  1.    Stoke’s law
  2.    Newton’s law
  3.    Boyle’s law
  4.    Charles’s law
 Discuss Question
Answer: Option A. -> Stoke’s law
Answer: (a).Stoke’s law
Question 39. Organo clays are manufactured by modifying _____with quaternary amines.
  1.    Nitrogen
  2.    Bentonite
  3.    Potassium
  4.    Sodium
 Discuss Question
Answer: Option B. -> Bentonite
Answer: (b).Bentonite
Question 40. Determine the surface area for the following information.
A/S = 0.008 mL/mg
Temperature: 20 degree Celsius
Air solubility: 18.7 mL/L
Recycle steam pressure: 275 kPa
Fraction of saturation: 0.5
Surface Loading rate: 8 L/m²/min
Sludge flow rate: 400 m³/d
  1.    34.7 m²
  2.    67.7 m²
  3.    38 m²
  4.    72 m²
 Discuss Question
Answer: Option A. -> 34.7 m²
Answer: (a).34.7 m²

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