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MCQs

Total Questions : 3241 | Page 4 of 325 pages
Question 31. JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
  1.    Nsh = 2
  2.    Nst = 2
  3.    Nsc = 2
  4.    None of these
 Discuss Question
Answer: Option A. -> Nsh = 2
Question 32. Which of the following is an undesirable property for an absorbing solvent?
  1.    Low vapour pressure
  2.    Low velocity
  3.    Low freezing point
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 33. The minimum liquid rate to be used in an absorber corresponds to an operating line
  1.    Of slope = 1
  2.    Ofslope = 0.1
  3.    Tangential to the equilibrium curve
  4.    None of these
 Discuss Question
Answer: Option C. -> Tangential to the equilibrium curve
Question 34. In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in
  1.    Reducing the axial mixing
  2.    Increasing the rate of extraction
  3.    Maintaining the concentration difference between the two phases
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 35. The operating line for an absorber is curved, when plotted in terms of
  1.    Mole fractions
  2.    Mole ratios
  3.    Partial pressure
  4.    Mass fractions
 Discuss Question
Answer: Option C. -> Partial pressure
Question 36. Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)
  1.    (De.t)1/2
  2.    (De/t)1/2
  3.    (4De/πt)1/2
  4.    (4De/t)
 Discuss Question
Answer: Option C. -> (4De/πt)1/2
Question 37. In paper industry, paper is dried in a __________ dryer.
  1.    Tunnel
  2.    Heated cylinder
  3.    Conveyor
  4.    Festoon
 Discuss Question
Answer: Option B. -> Heated cylinder
Question 38. Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.
  1.    Rotary
  2.    Vacuum
  3.    Tunnel
  4.    Tray
 Discuss Question
Answer: Option A. -> Rotary
Question 39. As per Gilliland's equation, the diffusivity is
  1.    Directly proportional to 'T1.5'
  2.    Inversely proportional to 'P'
  3.    Dependent on the molecular volume & molecular weight of components
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 40. H₂S present in naphtha reformed gas is removed by absorbing with
  1.    Ethanolamine
  2.    K₂CO₃
  3.    HCl
  4.    Vacuum gas oil
 Discuss Question
Answer: Option A. -> Ethanolamine

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