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MCQs

Total Questions : 32 | Page 1 of 4 pages
Question 1. For the multistage counter current gas dispersed operation, which of the following equipment is better?
  1.    Agitated vessel
  2.    Sparged vessel
  3.    Tray tower
  4.    Wetted wall column
 Discuss Question
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.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
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.    1.11
  2.    2.22
  3.    3.33
  4.    4.44
 Discuss Question
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
  1.    Agitated vessel
  2.    Sparged vessel
  3.    Tray tower
  4.    Wetted wall column
 Discuss Question
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
  1.    Liquid holdup
  2.    Gas holdup
  3.    Gas-liquid holdup
  4.    None of the mentioned
 Discuss Question
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.
  1.    7.786 x10⁻³
  2.    7.786 x10⁻⁴
  3.    9.832 x10⁻³
  4.    9.832 x10⁻⁴
 Discuss Question
Answer: Option A. -> 7.786 x10⁻³
Answer: (a).7.786 x10⁻³
Question 7. Find the process where an agitated vessel is required.
  1.    Vegetable oil hydrogenation
  2.    Production of penicillin
  3.    Paper stock chlorination
  4.    All of the mentioned
 Discuss Question
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
  1.    3.6 m/s
  2.    4.89 m/s
  3.    7.2 m/s
  4.    9.78 m/s
 Discuss Question
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______
  1.    Vessel
  2.    Sparger orifice
  3.    Volume of vessel/ interfacial area
  4.    None of the mentioned
 Discuss Question
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.
  1.    2 sq.m
  2.    4 sq.m
  3.    6 sq.m
  4.    12 sq.m
 Discuss Question
Answer: Option D. -> 12 sq.m
Answer: (d).12 sq.m

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