Lakshya Education MCQs

Question: Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
A.Less than
B.More than
C.Same as
D.Very much less
Answer: Option B

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Question 1. Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be
  1.    Cooled
  2.    Humidified
  3.    Both A & B
  4.    Dehumidified
Answer: Option B
Question 2. All moisture in a non-hygroscopic material is the __________ moisture.
  1.    Free
  2.    Equilibrium
  3.    Unbound
  4.    Bound
Answer: Option C
Question 3. In physical terms, Schmidt number means
  1.    Thermal diffusivity/mass diffusivity
  2.    Thermal diffusivity/momentum diffusivity
  3.    Momentum diffusivity/mass diffusivity
  4.    Mass diffusivity/thermal diffusivity
Answer: Option C
Question 4. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
  1.    Packed
  2.    Bubble
  3.    Spray
  4.    Tray
Answer: Option B
Question 5. Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is
  1.    25%
  2.    50%
  3.    70%
  4.    90%
Answer: Option B
Question 6. Flights in a rotary dryer are provided to
  1.    Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
  2.    Reduce the residence time of solid
  3.    Increase the residence time of the solid
  4.    None of these
Answer: Option A

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