Discussion
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- Question
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.
- 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.
- 1. 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
- 2. 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
- 3. Rivets are generally specified by the
Options- A. head diameter
- B. shank diameter
- C. overall length
- D. none of these Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
Options- A. Sorel-Lewis method.
- B. McCabe-Thiele's method.
- C. Ponchon-Savarit method.
- D. none of these. Discuss
- 8. Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.
Options- A. nozzle or rim
- B. flared out
- C. fluid in
- D. ring plate Discuss
- 9. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter
Options- A. increases
- B. decreases
- C. remain unaffected
- D. none of these Discuss
- 10. Pick out the wrong statement.
Options- A. Safety valves are provided in heat exchangers for removal of non-conden-sables.
- B. Liquid metals and dowtherm are used for very high temperature heating.
- C. In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube.
- D. A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining of the condensate. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 15 to 30
Correct Answer: back up condensate and cause water hammer in steam line.
Correct Answer: shank diameter
Correct Answer: 0.1 to 0.25
Correct Answer: total cost consideration (fixed cost of the column plus the cooling water & steam cost).
Correct Answer: All (a), (b) and (c).
Correct Answer: Sorel-Lewis method.
Correct Answer: nozzle or rim
Correct Answer: decreases
Correct Answer: Safety valves are provided in heat exchangers for removal of non-conden-sables.
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