Discussion
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- Question
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of
Options- A. (1.2)3/2
- B. (1.2)3/5
- C. (1.2)2/3
- D. (1.2)5/3
- Correct Answer
- (1.2)5/3
- 1. Pressure drop (?p) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as
Options- A. ?p = G
- B. ?p = G0.5
- C. ?p = G2
- D.
Discuss
- 2. The main purpose of providing stepping on the trays is to
Options- A. increase the residence time.
- B. decrease the pressure drop.
- C. facilitate handling of large flow rate of liquid.
- D. improve the flow condition. Discuss
- 3. The stress developed in a material without any permanent set is called the
Options- A. ultimate stress
- B. yield stress
- C. elastic limit
- D. breaking stress Discuss
- 4. Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?
Options- A. At the inner surface.
- B. At the mid thickness of the cylindrical wall.
- C. At the outer surface.
- D. None of these. Discuss
- 5. Pick out the wrong statement pertaining to the design of a basket type evaporator.
Options- A. It is used for high viscosity liquor having large rate of scaling.
- B. The tube bundle is suspended on bracket.
- C. There is no central downtake.
- D. Downtake is formed by the annular space between the bundle and the shell. Discuss
- 6. The value of fouling factor depends upon the
Options- A. characteristic of process fluid.
- B. velocity of process fluid containing suspended solids.
- C. suspended solids in the fluid.
- D. all (a), (b) and (c). Discuss
- 7. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m2.°C.
Options- A. 1250
- B. 2500
- C. 7500
- D. 15000 Discuss
- 8. __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.
Options- A. Radial flow
- B. Cross flow
- C. Split flow
- D. Cascade Discuss
- 9. In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.
Options- A. 3-5
- B. 5-11
- C. 8-15
- D. 12-18 Discuss
- 10. Pick out the wrong statement
Options- A. For all the cylindrical process vessels operating above atmospheric pressure, formed heads are used for closing the vessel.
- B. Fouling factor of river water is less than that of sea water.
- C. Risers provided in bubble cap trays in the distillation column facilitate the flow of both liquid and vapor.
- D. both (b) and (c). Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: ?p = G2
Correct Answer: facilitate handling of large flow rate of liquid.
Correct Answer: elastic limit
Correct Answer: At the inner surface.
Correct Answer: It is used for high viscosity liquor having large rate of scaling.
Correct Answer: all (a), (b) and (c).
Correct Answer: 7500
Correct Answer: Cross flow
Correct Answer: 5-11
Correct Answer: both (b) and (c).
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