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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