Discussion
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- Question
Optimum reflux ratio in a continuous distillation column is determined by the
Options- A. maximum permissible vapour velocity.
- B. flooding limit of the column.
- C. total cost consideration (fixed cost of the column plus the cooling water & steam cost).
- D. none of these.
- Correct Answer
- total cost consideration (fixed cost of the column plus the cooling water & steam cost).
- 1. Cooling water fouling factors vary in the range of 0.001 to 0.003
Options- A. (BTU/hr.ft2 . °F)-1
- B. (kcal/hr.m2 .°C)-1
- C. (W/m2.°K)-1
- D. (kcal/hr. m. °C)-1 Discuss
- 2. The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.
Options- A. 0.3 to 0.8
- B. 1.25 to 3.125
- C. 3.5 to 7.0
- D. 8-12 Discuss
- 3. With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will
Options- A. increase
- B. decrease
- C. remain unaffected
- D. increase or decrease depending on the nature of the dust. Discuss
- 4. The most common standard size of bubble caps used in industrial operation is
Options- A. 1" dia cap with 0.5" dia riser.
- B. 6" dia cap with 4" dia riser.
- C. 8" dia cap with 1" dia riser.
- D. 4" dia cap with 8" dia riser. Discuss
- 5. Which of the following is used to set the diameter of the distillation column?
Options- A. Number of theorectical plates.
- B. Static submergence.
- C. Allowable vapour velocity.
- D. Length of straight rectangular weir on cross-flow tray. Discuss
- 6. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.
Options- A. 0.1 to 0.25
- B. 0.3 to 0.5
- C. 0.5 to 0.6
- D. 0.65 to 0.80 Discuss
- 7. Rivets are generally specified by the
Options- A. head diameter
- B. shank diameter
- C. overall length
- D. none of these Discuss
- 8. An underdesigned steam trap will
Options- A. waste steam.
- B. destroy itself of acceleration wear due to rapid recycling.
- C. back up condensate and cause water hammer in steam line.
- D. none of these. Discuss
- 9. The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.
Options- A. 5 to 10
- B. 15 to 30
- C. 40 to 50
- D. 55 to 75 Discuss
- 10. Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
Options- A. Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution.
- B. Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids.
- C. The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
- D. In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: (BTU/hr.ft2 . °F)-1
Correct Answer: 1.25 to 3.125
Correct Answer: increase
Correct Answer: 6" dia cap with 4" dia riser.
Correct Answer: Allowable vapour velocity.
Correct Answer: 0.1 to 0.25
Correct Answer: shank diameter
Correct Answer: back up condensate and cause water hammer in steam line.
Correct Answer: 15 to 30
Correct Answer: The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
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