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- Question
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).
- Correct Answer
- all (a), (b) and (c).
- 1. 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
- 2. 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
- 3. In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
Options- A. 'n'th
- B. (1/n)th
- C. 0.5 nth
- D. 1.5 nth Discuss
- 4. Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
Options- A. The corrosive and fouling fluid should be preferably routed through the tubes.
- B. The viscous fluid should be routed through the shell side.
- C. Lower flow rate fluid should be routed through the shell side.
- D. Higher pressure fluid stream should be routed through the shell side. Discuss
- 5. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.
Options- A. working
- B. damaging
- C. allowable
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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. Discuss
- 9. 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
- 10. 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
Process Equipment and Plant Design problems
Search Results
Correct Answer: 600
Correct Answer: Flash distillation, differential distillation & steam distillation are all continuous distillation processes.
Correct Answer: (1/n)th
Correct Answer: Higher pressure fluid stream should be routed through the shell side.
Correct Answer: damaging
Correct Answer: all (a), (b) and (c).
Correct Answer: 1.25-1.50 times
Correct Answer: of its flexibility and nearly constant efficiency under varying conditions of operation.
Correct Answer: all (a); (b) and (c).
Correct Answer: bubble cap
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