Discussion
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- Question
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
- Correct Answer
- 0.1 to 0.25
- 1. 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. Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Rivets are generally specified by the
Options- A. head diameter
- B. shank diameter
- C. overall length
- D. none of these Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?
Options- A. Size, shape, orientation and surface of the packing particles.
- B. Density and viscosity of fluids.
- C. Fluid flow rates.
- D. All (a), (b) and (c). Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: total cost consideration (fixed cost of the column plus the cooling water & steam cost).
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: 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.
Correct Answer: All (a), (b) and (c).
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