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- Question
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?
Options- A. Sensible heat changes for vapour & liquid are negligibly small.
- B. Reflux is not a saturated liquid.
- C. Molar latent heat of the two components are equal.
- D. Heat of mixing of normal liquid is assumed to be zero.
- Correct Answer
- Reflux is not a saturated liquid.
- 1. Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.
Options- A. 1.5 to 2
- B. 2.5 to 5
- C. 5 to 10
- D. 10 to 15 Discuss
- 2. Bracket supports are the most suitable for supporting __________ vessels.
Options- A. thick walled vertical
- B. horizontal
- C. thin shperical (e.g. Horton sphere)
- D. none of these Discuss
- 3. It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than
Options- A. 0.99
- B. 0.95
- C. 0.80
- D. 0.55 Discuss
- 4. Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
Options- A. The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation.
- B. Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps.
- C. The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4.
- D. none of these. Discuss
- 5. Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
Options- A. ultimate stress to breaking stress.
- B. ultimate stress to working stress.
- C. working stress to ultimate stress.
- D. none of these. Discuss
- 6. In a heat exchanger, shell side fluid velocity can be changed by changing the tube
Options- A. layout
- B. pitch
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 7. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
Options- A. Di, opt = 3 Q0.36 ?0.18
- B. Di, opt = 3.9 Q0.45 . ?0.23
- C. Di, opt = 7.6 Q0.36 . ?0.9
- D. Di, opt = 3 Q0.36 . ?1.86 ?0.08 Discuss
- 8. Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.
Options- A. 5
- B. 20
- C. 35
- D. 55 Discuss
- 9. In perforated plate towers, the
Options- A. hole sizes may be around 1/8" or 3/16".
- B. total hole area may be around 6 to 15% of tower cross-sectional area.
- C. pressure drop is less compared is similar bubble cap towers.
- D. all (a), (b) and (c). Discuss
- 10. A rivetted joint does not fail by __________ of rivets.
Options- A. tearing
- B. shearing
- C. tearing of the plate across a row
- D. none of these Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 2.5 to 5
Correct Answer: thick walled vertical
Correct Answer: 0.80
Correct Answer: none of these.
Correct Answer: ultimate stress to working stress.
Correct Answer: both (a) & (b)
Correct Answer: Di, opt = 3 Q0.36 ?0.18
Correct Answer: 20
Correct Answer: all (a), (b) and (c).
Correct Answer: none of these
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