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MCQs

Total Questions : 88 | Page 5 of 9 pages
Question 41. Compute the required recycled rate for the flotation thickener with recycle for the following information:
A/S = 0.008 mL/mg
p = 275 atm
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.    462 m³/d
  2.    642 m³/d
  3.    380 m³/d
  4.    680 m³/d
 Discuss Question
Answer: Option A. -> 462 m³/d
Answer: (a).462 m³/d
Question 42. Lamella clarifier is also called as a inclined plate settler.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 43. What is the velocity considered for a flotation thickener to remove oil?
  1.    8 L/m²/min -160 L/m²/min
  2.    180 L/m²/min
  3.    200 L/m²/min-250 L/m²/min
  4.    2 L/m²/min-8 L/m²/min
 Discuss Question
Answer: Option A. -> 8 L/m²/min -160 L/m²/min
Answer: (a).8 L/m²/min -160 L/m²/min
Question 44. Determine the surface area with 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.    40.1 m²
  2.    47.7 m²
  3.    38 m²
  4.    72 m²
 Discuss Question
Answer: Option A. -> 40.1 m²
Answer: (a).40.1 m²
Question 45. Lamella clarifiers can also be used in mining industries.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 46. What is the recycle ratio considered while designing the dissolved air floatation process?
  1.    10-30
  2.    1-4
  3.    4-9
  4.    6-12
 Discuss Question
Answer: Option D. -> 6-12
Answer: (d).6-12
Question 47. DAF separates _______ in water.
  1.    Suspended particles
  2.    Dissolved particles
  3.    Floating particles
  4.    Settleable solids
 Discuss Question
Answer: Option A. -> Suspended particles
Answer: (a).Suspended particles
Question 48. What is the detention time considered for the contact zone while designing the conventional dissolved air floatation process?
  1.    1-2.5 mins
  2.    2.5-4 mins
  3.    4-9 mins
  4.    9-15 mins
 Discuss Question
Answer: Option A. -> 1-2.5 mins
Answer: (a).1-2.5 mins
Question 49. Which of these pollutants does a lamella clarifier remove?
  1.    TSS
  2.    BOD
  3.    TDS
  4.    Odour
 Discuss Question
Answer: Option A. -> TSS
Answer: (a).TSS
Question 50. What is the maximum rise rate in m³/m²/h considered while designing a Lamella clarifier?
  1.    1
  2.    2
  3.    1.2
  4.    1.5
 Discuss Question
Answer: Option C. -> 1.2
Answer: (c).1.2

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