Discussion
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- Question
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
- Correct Answer
- 20
- 1. 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
- 2. 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
- 3. 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. Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8.
for fully open globe value may be around
Options- A. 10
- B. 25
- C. 75
- D. 300 Discuss
- 9. The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.
Options- A. Flat plate
- B. Hemispherical
- C. Torispherical
- D. Ellipsoidal Discuss
- 10. In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.
Options- A. 10
- B. 20
- C. 30
- D. 35 Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: Di, opt = 3 Q0.36 ?0.18
Correct Answer: both (a) & (b)
Correct Answer: Reflux is not a saturated liquid.
Correct Answer: 2.5 to 5
Correct Answer: thick walled vertical
Correct Answer: all (a), (b) and (c).
Correct Answer: none of these
Correct Answer: 300
Correct Answer: Ellipsoidal
Correct Answer: 10
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