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Total Questions : 3241 | Page 3 of 325 pages
Question 21. What is the reflux ratio at total reflux?
  1.    Zero
  2.    Infinity
  3.    Unity
  4.    Data insufficient
 Discuss Question
Answer: Option B. -> Infinity
Question 22. The diffusivity (D) in a binary gas mixture is related to the pressure (P) as
  1.    D ∝ P0.5
  2.    D ∝ 1/P0.5
  3.    D ∝ 1/P
  4.    D ∝ 1/P1.5
 Discuss Question
Answer: Option C. -> D ∝ 1/P
Question 23. Which of the following same diameter columns gives lowest pressure drop per unit height?
  1.    Bubble-cap column
  2.    Sieve-plate column
  3.    Packed column (stacked)
  4.    Randomly packed column
 Discuss Question
Answer: Option C. -> Packed column (stacked)
Question 24. Reverse osmosis is also called
  1.    Dialysis
  2.    Electrodilysis
  3.    Diffusion
  4.    Ultrafiltration
 Discuss Question
Answer: Option D. -> Ultrafiltration
Question 25. Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.
  1.    Indirect tray
  2.    Spray
  3.    Freeze
  4.    None of these
 Discuss Question
Answer: Option C. -> Freeze
Question 26. Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as
  1.    D0.5
  2.    D
  3.    1/D
  4.    D1.5
 Discuss Question
Answer: Option A. -> D0.5
Question 27. For absorbing a sparingly soluble gas in a liquid
  1.    Gas side mass transfer co-efficient should be increased
  2.    Liquid side mass transfer co-efficient should be increased
  3.    Liquid side mass transfer co-efficient should be decreased
  4.    Mass transfer co-efficient must be kept constant
 Discuss Question
Answer: Option B. -> Liquid side mass transfer co-efficient should be increased
Question 28. Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.
  1.    Rotary
  2.    Tray
  3.    Freeze
  4.    None of these
 Discuss Question
Answer: Option B. -> Tray
Question 29. The equipment used in the extraction of highly corrosive radio active liquids is
  1.    Pulse column
  2.    Spray column
  3.    Mixer settler
  4.    Baffle tower
 Discuss Question
Answer: Option A. -> Pulse column
Question 30. The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is
  1.    1
  2.    ∞
  3.    0.5
  4.    2
 Discuss Question
Answer: Option A. -> 1

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