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MCQs

Total Questions : 94 | Page 3 of 10 pages
Question 21. Which type of mixer is used when the flow needs to be changed often?
  1.    Paddle mixer
  2.    Static mixer
  3.    Mechanical mixer
  4.    Mechanical aerator
 Discuss Question
Answer: Option B. -> Static mixer
Answer: (b).Static mixer
Question 22. In which of the following systems no flow is added or allowed to leave during the design detention time?
  1.    Arbitrary flow reactor
  2.    Fluidized bed reactor
  3.    Mixed batch reactor
  4.    Packed bed reactor
 Discuss Question
Answer: Option C. -> Mixed batch reactor
Answer: (c).Mixed batch reactor
Question 23. In order to prevent clogging what should be provided prior to tube settlers?
  1.    Clarifiers
  2.    Coarse screen
  3.    Fine screen
  4.    Grit chamber
 Discuss Question
Answer: Option C. -> Fine screen
Answer: (c).Fine screen
Question 24. Which of these is not a type of grit chamber?
  1.    Horizontal flow
  2.    Vortex
  3.    Vertical flow
  4.    Aerated
 Discuss Question
Answer: Option C. -> Vertical flow
Answer: (c).Vertical flow
Question 25. What is the detention time considered while designing a Grit chamber?
  1.    20-40 sec
  2.    10-20 sec
  3.    90-120 sec
  4.    45-90 sec
 Discuss Question
Answer: Option D. -> 45-90 sec
Answer: (d).45-90 sec
Question 26. Which type of reactor is not subjected to back mixing?
  1.    Plug flow
  2.    Completely stirred reactor
  3.    Batch reactors
  4.    Venturi reactor
 Discuss Question
Answer: Option A. -> Plug flow
Answer: (a).Plug flow
Question 27. Which type of reactor is used in precipitation reactions?
  1.    Fluidised bed reactor
  2.    Plug flow reactor
  3.    Venturi reactor
  4.    Recycle reactor
 Discuss Question
Answer: Option D. -> Recycle reactor
Answer: (d).Recycle reactor
Question 28. Which type of reactor is used in ion exchange or adsorption?
  1.    Fixed bed reactor
  2.    Venturi reactor
  3.    Plug flow reactor
  4.    Continuous flow stirred reactor
 Discuss Question
Answer: Option A. -> Fixed bed reactor
Answer: (a).Fixed bed reactor
Question 29. In which type of reactor diffusion and dispersion contribute to solid fluxes into and out of the reactor?
  1.    Venturi reactor
  2.    Open reactor
  3.    Closed reactor
  4.    Recycle reactor
 Discuss Question
Answer: Option B. -> Open reactor
Answer: (b).Open reactor
Question 30. Which type of reactor is used for stripping off gases from water?
  1.    Venturi reactor
  2.    Packed bed reactor
  3.    Plug flow reactor
  4.    Continuous stirred reactor
 Discuss Question
Answer: Option B. -> Packed bed reactor
Answer: (b).Packed bed reactor

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