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MCQs

Total Questions : 135 | Page 2 of 14 pages
Question 11. Which of the following is not true in case of closing the top of the vessel?
  1.    Keeps out sunlight
  2.    Limits algal growth
  3.    Restricts bug access
  4.    Eliminates odour
 Discuss Question
Answer: Option D. -> Eliminates odour
Answer: (d).Eliminates odour
Question 12. As the compression increases, the porosity in filter bed _____
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Alters
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 13. Which of these does high rate filters not remove?
  1.    Phosphorous
  2.    Suspended Solids
  3.    Colloidal Solids
  4.    Organic matter(particulate)
 Discuss Question
Answer: Option D. -> Organic matter(particulate)
Answer: (d).Organic matter(particulate)
Question 14. What is the life of the media used?
  1.    2 years
  2.    5 years
  3.    8 years
  4.    10 years
 Discuss Question
Answer: Option D. -> 10 years
Answer: (d).10 years
Question 15. What is the percentage of wash water?
  1.    >5%
  2.    >3%
  3.    >2%
  4.    <2%
 Discuss Question
Answer: Option D. -> <2%
Answer: (d).<2%
Question 16. At what pressure is the air blown during cleaning?
  1.    5-10 KN/m²
  2.    10-15 KN/m²
  3.    15-30 KN/m²
  4.    20-35 KN/m²
 Discuss Question
Answer: Option D. -> 20-35 KN/m²
Answer: (d).20-35 KN/m²
Question 17. What is the specified minimum time for backwash of rapid filters?
  1.    2 minutes
  2.    5 minutes
  3.    10 minutes
  4.    3 minutes
 Discuss Question
Answer: Option B. -> 5 minutes
Answer: (b).5 minutes
Question 18. What is the rate of backwash water?
  1.    0.3-1 m/min
  2.    1-1.5 m/min
  3.    0.03-0.3 m/min
  4.    15-3 m/min
 Discuss Question
Answer: Option A. -> 0.3-1 m/min
Answer: (a).0.3-1 m/min
Question 19. Pre-treatment of beds is not necessary.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 20. What is the size of the small rapid sand filter bed?
  1.    50 sqm
  2.    80 sqm
  3.    100 sqm
  4.    120 sqm
 Discuss Question
Answer: Option C. -> 100 sqm
Answer: (c).100 sqm

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