Humidification Operations(Mass Transfer ) Questions and Answers
Question 1. For the multistage counter current gas dispersed operation, which of the following equipment is better?
Agitated vessel
Sparged vessel
Tray tower
Wetted wall column
Explanation:-
Answer: Option B. -> Sparged vessel Answer: (b).Sparged vessel
Question 2. In a Sparged vessel of area 50 cm, the flow rate of the gas is 2 cubic meters per second then the value of superficial gas velocity in meters per second is
1
2
3
4
Explanation:-
Answer: Option D. -> 4 Answer: (d).4
Question 3. In sparged vessel of area 50 cm and a gas holdup of 3 cubic meters per cubic meters, the flow rate of the gas is 5 cubic meters per second. The value of true gas velocity in meters per second is
1.11
2.22
3.33
4.44
Explanation:-
Answer: Option C. -> 3.33 Answer: (c).3.33
Question 4. During gas dispersion, if a chemical reaction between gas and liquid phase is needed, then the preferred equipment is
Agitated vessel
Sparged vessel
Tray tower
Wetted wall column
Explanation:-
Answer: Option A. -> Agitated vessel Answer: (a).Agitated vessel
Question 5. The fraction of volume occupied by the gas-liquid mixture in the equipment/vessel to the volume occupied by the gas is
Liquid holdup
Gas holdup
Gas-liquid holdup
None of the mentioned
Explanation:-
Answer: Option B. -> Gas holdup Answer: (b).Gas holdup
Question 6. Guess the diameter of the bubble for an air-water system in a sparged vessel with gas holdup of 0.1 and liquid flow rate of 0.15 meters per second.
7.786 x10⁻³
7.786 x10⁻⁴
9.832 x10⁻³
9.832 x10⁻⁴
Explanation:-
Answer: Option A. -> 7.786 x10⁻³ Answer: (a).7.786 x10⁻³
Question 7. Find the process where an agitated vessel is required.
Vegetable oil hydrogenation
Production of penicillin
Paper stock chlorination
All of the mentioned
Explanation:-
Answer: Option D. -> All of the mentioned Answer: (d).All of the mentioned
Question 8. If the relative velocity of the gas and liquid inside the bubble column of cross sectional area 0.2 meters with gas holdup of 0.736 is 3.6 meters square per second. The expected slip velocity is
3.6 m/s
4.89 m/s
7.2 m/s
9.78 m/s
Explanation:-
Answer: Option A. -> 3.6 m/s Answer: (a).3.6 m/s
Question 9. In a Bubble column, if the velocity of the gas is low, then the bubble diameter is equals to______
Vessel
Sparger orifice
Volume of vessel/ interfacial area
None of the mentioned
Explanation:-
Answer: Option B. -> Sparger orifice Answer: (b).Sparger orifice
Question 10. Guess the interfacial area of a bubble with a gas volume of 2.5 x10⁻³ cubic meters and diameter of 0.125 cm.