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MCQs

Total Questions : 112 | Page 3 of 12 pages
Question 21. In which type of aerator, the flow of water is divided into fine streams and small droplets?
  1.    Cascade aerator
  2.    Inclined apron aerator
  3.    Spray aerator
  4.    Gravel bed aerator
 Discuss Question
Answer: Option A. -> Cascade aerator
Answer: (a).Cascade aerator
Question 22. ______ are used in fine screen so that they do not get clogged up.
  1.    Automatic strainers
  2.    Spray aerators
  3.    Cascade aerators
  4.    Gravel bed aerators
 Discuss Question
Answer: Option A. -> Automatic strainers
Answer: (a).Automatic strainers
Question 23. The elapsed time in gravity filter is 1sec. What is the height of fall in a single descent?
  1.    4.4m
  2.    4.9m
  3.    8.8m
  4.    9.8m
 Discuss Question
Answer: Option B. -> 4.9m
Answer: (b).4.9m
Question 24. The Total hardness of soft water as CaCO₃ equivalent is __________
  1.    50ppm
  2.    100ppm
  3.    150ppm
  4.    200ppm
 Discuss Question
Answer: Option A. -> 50ppm
Answer: (a).50ppm
Question 25. The total hardness of water is 100ppm as CaCO₃ equivalent. What is the type of water?
  1.    Soft
  2.    Moderately hard
  3.    Hard
  4.    Very hard
 Discuss Question
Answer: Option B. -> Moderately hard
Answer: (b).Moderately hard
Question 26. The permanent hardness in water is due to the presence of __________
  1.    Sulfates, Chlorides
  2.    Sulfates, chlorides, nitrates
  3.    Carbonates and bicarbonates
  4.    Sulfates and carbonates
 Discuss Question
Answer: Option B. -> Sulfates, chlorides, nitrates
Answer: (b).Sulfates, chlorides, nitrates
Question 27. The temporary hardness in water is due to the presence of __________
  1.    Sulfates, Chlorides
  2.    Sulfates, Chlorides, nitrates
  3.    Carbonates and bicarbonates
  4.    Sulfates and carbonates
 Discuss Question
Answer: Option C. -> Carbonates and bicarbonates
Answer: (c).Carbonates and bicarbonates
Question 28. Which of the following is not used for removing the permanent hardness?
  1.    Lime soda process
  2.    Zeolite process
  3.    Demineralization
  4.    Adding lime
 Discuss Question
Answer: Option D. -> Adding lime
Answer: (d).Adding lime
Question 29. Which of the following causes the temporary hardness?
  1.    CaSO₄
  2.    MgSO₄
  3.    MgCl₂
  4.    Ca(HCO₃)₂
 Discuss Question
Answer: Option D. -> Ca(HCO₃)₂
Answer: (d).Ca(HCO₃)₂
Question 30. The permanent hardness is also known as __________
  1.    Pseudo hardness
  2.    Non carbonate hardness
  3.    Carbonate hardness
  4.    Brinell hardness
 Discuss Question
Answer: Option B. -> Non carbonate hardness
Answer: (b).Non carbonate hardness

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