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MCQs

Total Questions : 3241 | Page 6 of 325 pages
Question 51. High pressure at the bottom of a distillation tower handling heat sensitive materials results in
  1.    Thermal decomposition of bottoms
  2.    Increased relative volatility
  3.    Erosion of the tower
  4.    Very efficient operation
 Discuss Question
Answer: Option A. -> Thermal decomposition of bottoms
Question 52. Mass transfer co-efficient of liquid is
  1.    Affected more by temperature than that for gases
  2.    Affected much less by temperature than that for gases
  3.    Not affected by the temperature
  4.    None of these
 Discuss Question
Answer: Option A. -> Affected more by temperature than that for gases
Question 53. In a counter-current extractor, as the axial mixing increases, the extraction efficiency
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    Depends on the pressure of the system
 Discuss Question
Answer: Option B. -> Decreases
Question 54. The rate of mass transfer is not dependent upon the
  1.    Degree of dispersion of one fluid in the other
  2.    Interfacial surface exposed between the phases
  3.    Both A & B
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 55. Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.
  1.    Sherwood
  2.    Schmidt
  3.    Peclet
  4.    Stanton
 Discuss Question
Answer: Option A. -> Sherwood
Question 56. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.
  1.    Schmidt
  2.    Sherwood
  3.    Peclet
  4.    Stanton
 Discuss Question
Answer: Option A. -> Schmidt
Question 57. The expression, y(1 - x)/x(1 - y) is for
  1.    Absorption factor
  2.    Relative volatility
  3.    Selectivity
  4.    Murphree efficiency
 Discuss Question
Answer: Option B. -> Relative volatility
Question 58. When both the fluids flow concurrently in an absorber, the slope of the operating line is
  1.    - ve
  2.    + ve
  3.    1
  4.    -1
 Discuss Question
Answer: Option A. -> - ve
Question 59. The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)
  1.    L/mG
  2.    G/mL
  3.    ML/G
  4.    LG/m
 Discuss Question
Answer: Option A. -> L/mG
Question 60. Smoke is an example of
  1.    Solid dispersed in liquid
  2.    Solid dispersed in gas
  3.    Liquid dispersed in gas
  4.    Gas dispersed in liquid
 Discuss Question
Answer: Option B. -> Solid dispersed in gas

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