What is the Difference Between Convection and Diffusion MCQ - Set 42

Practice Test: Question Set - 42

1. Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is
    (A) Less
    (B) More
    (C) Same
    (D) Unpredictable
2. Solvent used in extractive distillation
    (A) Changes the relative volatility of the original components
    (B) Should be of high volatility
    (C) Should form azeotropes with the original components
    (D) All (a), (b) and (c)
3. The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
    (A) Natural draft cooling tower
    (B) Induced draft cooling tower
    (C) Spray chamber
    (D) None of these
4. CO2 can be absorbed by
    (A) Hot cupric oxide
    (B) Heated charcoal
    (C) Cold Ca(OH)2
    (D) Alumina
5. The Knudsen diffusivity is dependent on the
    (A) Molecular velocity only
    (B) Pore radius of the catalyst only
    (C) Molecular mean free path only
    (D) Molecular velocity and pore radius of the catalyst
6. Critical humidity of a solid salt means the humidity
    (A) Above which it will always become damp
    (B) Below which it will always stay dry
    (C) Both (a) and (b)
    (D) Above Which it will always become dry and below which it will always stay damp
7. For a binary mixture with low relative volatility, continuous rectification to get pure products will require
    (A) Low reflux ratio
    (B) Less number of trays
    (C) Small cross-section column
    (D) High reflux ratio
8. Overall efficiency of the distillation column is
    (A) The ratio of number of ideal plates to actual plates
    (B) The ratio of number of actual plates to ideal plates
    (C) Same as the Murphree efficiency
    (D) Always more than the point efficiency
9. The binary diffusivity in gases does not depend upon the
    (A) Pressure
    (B) Temperature
    (C) Nature of the components
    (D) None of these
10. Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in
    (A) Viscosity with concentration
    (B) Degree of ideality of the solution
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)
11. The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are
    (A) Parallel
    (B) Straight
    (C) Both parallel and straight
    (D) Neither parallel nor straight
12. For contacting a highly soluble gas with a liquid
    (A) Bubble the gas through liquid
    (B) Spray the liquid on gas stream
    (C) Either (a) or (b) would suffice
    (D) None of these
13. Which of the following remains constant during sensible cooling process?
    (A) Specific humidity
    (B) Partial pressure of vapor
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)
14. In saturated gas, the
    (A) Vapor is in equilibrium with the liquid at the gas temperature
    (B) Vapor is in equilibrium with the liquid at the room temperature
    (C) Partial pressure of vapor equals the vapor pressure of the liquid at room temperature
    (D) None of these
15. In a counter-current extractor, as the axial mixing increases, the extraction efficiency
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) Depends on the pressure of the system
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