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MCQs

Total Questions : 94 | Page 6 of 10 pages
Question 51. Which type of mixers are used to mix coagulants like alum, ferric ammonium sulphate and coagulant aids such as polyelectrolyte and lime?
  1.    Static mixers
  2.    Mechanical mixers
  3.    Mechanical aerators
  4.    Paddle mixers
 Discuss Question
Answer: Option D. -> Paddle mixers
Answer: (d).Paddle mixers
Question 52. What is the maximum approach velocity to be considered for a mechanical screen while designing it?
  1.    0.3-0.5m/s
  2.    0.6-1m/s
  3.    1-1.5m/s
  4.    2 m/s
 Discuss Question
Answer: Option B. -> 0.6-1m/s
Answer: (b).0.6-1m/s
Question 53. What is the percentage of TSS removed by a rotary drum fine screen?
  1.    50%
  2.    60%
  3.    65-75%
  4.    25-45%
 Discuss Question
Answer: Option D. -> 25-45%
Answer: (d).25-45%
Question 54. What is the size of the openings for a fine screen?
  1.    0.1 mm
  2.    0.8-1mm
  3.    0.2-0.6mm
  4.    1-3mm
 Discuss Question
Answer: Option C. -> 0.2-0.6mm
Answer: (c).0.2-0.6mm
Question 55. Hydrolysis of chlorine in water has a rate constant of 11 s⁻¹. What does this imply?
  1.    It is a slow reaction.
  2.    It is a moderate reaction
  3.    It is a fast reaction
  4.    It is a very slow reaction
 Discuss Question
Answer: Option C. -> It is a fast reaction
Answer: (c).It is a fast reaction
Question 56. In which type of reactor, mixing is uniform?
  1.    Ideal reactor
  2.    Batch reactor
  3.    Non-ideal reactor
  4.    Fixed bed reactor
 Discuss Question
Answer: Option A. -> Ideal reactor
Answer: (a).Ideal reactor
Question 57. Which type of reactor is used for mixing chemicals in water treatment?
  1.    Continuous reactor
  2.    Batch reactor
  3.    Plug flow reactor
  4.    Fixed bed reactor
 Discuss Question
Answer: Option B. -> Batch reactor
Answer: (b).Batch reactor
Question 58. Which reactors are characterized by non-continuous reactions?
  1.    Plug flow reactor
  2.    Continuous reactor
  3.    Batch reactor
  4.    Fluidized bed reactor
 Discuss Question
Answer: Option C. -> Batch reactor
Answer: (c).Batch reactor
Question 59. Which type of reactor is not used for oxidation?
  1.    Packed bed reactor
  2.    Stirred tanks
  3.    Tank in series
  4.    Venturi reactor
 Discuss Question
Answer: Option A. -> Packed bed reactor
Answer: (a).Packed bed reactor
Question 60. Nitrification efficiency is significantly suppressed as the temperature is _________
  1.    Increased
  2.    Decreased
  3.    Neutral
  4.    Maintained
 Discuss Question
Answer: Option B. -> Decreased
Answer: (b).Decreased

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