Discussion
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- Question
Bubble cap tray is the most commonly used tray in large distillation column, because
Options- A. of its flexibility and nearly constant efficiency under varying conditions of operation.
- B. it incurs less pressure drop as compared to any other try designed for the same duty.
- C. it eliminates the foaming and entrain-ment tendency during operation.
- D. none of these.
- Correct Answer
- of its flexibility and nearly constant efficiency under varying conditions of operation.
- 1. In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.
Options- A. less than
- B. 1.25-1.50 times
- C. 2.5 times
- D. one-fourth of Discuss
- 2. Movement of pipeline caused by thermal expansion is taken care by providing
Options- A. expansion joint.
- B. changes in its direction.
- C. change in the shape of pipeline.
- D. all (a), (b) and (c). Discuss
- 3. 1.2 to 3.8 cms is the value of the
Options- A. downcomer liquid seal in case of a balanced tray design.
- B. static submergence in case of a bubble cap tray for column operating under pressure (? 1 atm.).
- C. skirt clearance for bubble caps.
- D. all (a), (b) and (c). Discuss
- 4. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.
Options- A. 300
- B. 600
- C. 1000
- D. 1500 Discuss
- 5. Pick out the wrong statement about distillation operation
Options- A. Distillation under vacuum is a substitute for steam distillation.
- B. In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation.
- C. In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other.
- D. Flash distillation, differential distillation & steam distillation are all continuous distillation processes. Discuss
- 6. The necessary wall thickness for a metallic storage vessel is a function of the
Options- A. ultimate tensile strength (or yield point) of the material and operating temperature.
- B. operating pressure and welding/joint efficiency.
- C. diameter of the vessel.
- D. all (a); (b) and (c). Discuss
- 7. For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.
Options- A. sieve
- B. valve
- C. counterflow
- D. bubble cap Discuss
- 8. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
Options- A. 5-10
- B. 15-20
- C. 30-35
- D. 35-40 Discuss
- 9. Pick out the wrong statement
Options- A. In a flanged and standard dished head, the crown radius is ? shell outside diameter.
- B. In a flanged and shallow dished head, the crown radius is > shell outside diameter.
- C. Flat head covers are most suitable for larger vessels operating at very high pressure.
- D. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses. Discuss
- 10. In a bag filter, the pressure drop increases directly as the
Options- A. density of the gas, but is independent of the viscosity of the gas.
- B. density of the gas and inversely as viscosity of the gas.
- C. viscosity of the gas and inversely as density of the gas.
- D. none of these. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 1.25-1.50 times
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) and (c).
Correct Answer: 600
Correct Answer: Flash distillation, differential distillation & steam distillation are all continuous distillation processes.
Correct Answer: all (a); (b) and (c).
Correct Answer: bubble cap
Correct Answer: 15-20
Correct Answer: Flat head covers are most suitable for larger vessels operating at very high pressure.
Correct Answer: density of the gas and inversely as viscosity of the gas.
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