Mass Transfer Chemical Engineering Objective Questions & Answers - ObjectiveBooks
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Mass Transfer Chemical Engineering Objective Questions & Answers

Practice Test: Question Set - 44


1. For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).
    (A) 1-5
    (B) 10-60
    (C) 200-300
    (D) > 500

2. Berl saddle made of carbon cannot be used for
    (A) Alkalis
    (B) SO2
    (C) H2SO4
    (D) Oxidizing atmosphere

3. Capacity of a rotary dryer depends on its
    (A) rpm
    (B) Inclination with ground surface
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

4. The most common packing used in industrial operations is __________ rings.
    (A) Raschig
    (B) Lessing
    (C) Cross-partition
    (D) Single spiral

5. Refractory bricks are usually dried in a __________ dryer.
    (A) Tray
    (B) Tunnel
    (C) Conveyor
    (D) Festoon

6. Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
    (A) Increases
    (B) Decreases
    (C) Does not affect
    (D) Exponentially increases

7. The binary diffusivity in gases at atmospheric conditions is about
    (A) 10-9 cm/sec
    (B) 10-1 cm2/sec
    (C) 10-3 sec/cm
    (D) 10-4 cm2/sec2

8. For absorbers, high pressure drop results in
    (A) Increased efficiency
    (B) Decreased efficiency
    (C) High operating cost
    (D) Better gas liquid contact

9. __________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid.
    (A) Dew point
    (B) Bubble point
    (C) Dry bulb temperature
    (D) Wet bulb temperature

10. ‘L/mG’ is the expression for
    (A) Absorption factor
    (B) Brinkman number
    (C) Slope of operating line in absorber
    (D) Slope of operating line in stripper

11. Which of the following is the most commonly used leaching solvent in vegetable oil industry?
    (A) Phenol
    (B) Hexane
    (C) Furfural
    (D) Liquid SO2

12. When a multistage tray tower uses a minimum reflux ratio, it implies
    (A) Infinite trays and maximum reboiler heat load
    (B) Infinite trays and minimum reboiler heat load
    (C) Minimum trays and minimum reboiler heat load
    (D) Minimum trays and maximum reboiler heat load

13. In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when
    (A) Saturated feed is not used
    (B) An azeotrope forms
    (C) The latent heat of vaporization of the more and less volatile components are greatly different
    (D) A total condenser is used

14. During drying of a solid, the critical moisture content increases with
    (A) Decreased drying rate
    (B) Increased thickness of the solid
    (C) Increased drying rate
    (D) Both (b) and (c)

15. Stage efficiency in a leaching process depends on the
    (A) Time of contact between the solid and the solution
    (B) Rate of diffusion of the solute through the solid and into the liquid
    (C) Both (a) and (b)
    (D) Vapor pressure of the solution

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