Discussion
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- Question
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.
Options- A. 1-5
- B. 20-40
- C. 100-150
- D. 1000-1500
- Correct Answer
- 20-40
- 1. Pick out the wrong statement.
In an agitated vertical cylinderical reaction vessel, the
Options- A. ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1.
- B. filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period.
- C. flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids.
- D. dished bottom vessel has very high power consumption. Discuss
- 2. A stuffing box is used for
Options- A. absorbing the contraction/expansion of pipeline due to temperature changes.
- B. prevention of fluid leakage around moving parts.
- C. facilitating smooth opening and closing of a valve.
- D. reducing the resistance of fluid flow. Discuss
- 3. Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.
Options- A. 0.1 to 2
- B. 5 to 7
- C. 3 to 8
- D. 8 to 15 Discuss
- 4. The operating pressure drop range in a bag filter is about __________ mm water gauge.
Options- A. 50-150
- B. 5-10
- C. 500-1500
- D. 1500-2500 Discuss
- 5. Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.
Options- A. 2
- B. 1/2
- C. 4
- D. 8 Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Process Equipment and Plant Design problems
Search Results
Correct Answer: dished bottom vessel has very high power consumption.
Correct Answer: prevention of fluid leakage around moving parts.
Correct Answer: 0.1 to 2
Correct Answer: 50-150
Correct Answer: 8
Correct Answer: It is used for high viscosity liquor having large rate of scaling.
Correct Answer: At the inner surface.
Correct Answer: elastic limit
Correct Answer: facilitate handling of large flow rate of liquid.
Correct Answer: ?p = G2
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