Discussion
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- Question
Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is
Options- A. same
- B. less
- C. about 3 times
- D. about 0.33 times Discuss
- 2. In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a
Options- A. clearance of 25-75 mm.
- B. cap pitch of 1.3-2 times the cap diameter.
- C. either 'a' or 'b'.
- D. neither 'a' nor 'b'. Discuss
- 3. To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to
Options- A. 0.5 d
- B. d
- C. 1.5 d
- D. 2.5 d Discuss
- 4. For turbulent flow (NRe > 2100) of low viscosity fluid (? > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec.? = fluid density, lb/ft3 ? = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)
Options- A. Di, opt = 3.9 Q0.45 ?0.13
- B. Di, opt = 3.9 Q0.45 . ?0.95
- C. Di, opt = 4.7 Q0.36 . ?3.2?0.13
- D. Di, opt = 3 Q0.36 . ?0.88 Discuss
- 5. Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
Options- A. 2.5"
- B. 0.5"
- C. 5"
- D. 50% of the plate spacing Discuss
- 6. The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.
Options- A. equal to
- B. more than
- C. less than
- D. either (b) or (c); depends on maximum permissible internal pressure Discuss
- 7. Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from
Options- A. 1.5-2.5
- B. 3.5-5.5
- C. 7.5-10.0
- D. 10-15 Discuss
- 8. Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness.
Options- A. 1 to 5
- B. 10 to 20
- C. 30 to 40
- D. 40 to 50 Discuss
- 9. The LMTD correction factor (FT) is defined as the
Options- A. ratio of true temperature difference to the LMTD.
- B. ratio of LMTD to the true temperature difference.
- C. differenced of true temperature difference and the LMTD.
- D. geometric mean of the true temperature difference and the LMTD. Discuss
- 10. The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.
Options- A. equal to
- B. half
- C. one fourth
- D. three fourth Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: about 3 times
Correct Answer: either 'a' or 'b'.
Correct Answer: 1.5 d
Correct Answer: Di, opt = 3.9 Q0.45 ?0.13
Correct Answer: 0.5"
Correct Answer: more than
Correct Answer: 1.5-2.5
Correct Answer: 10 to 20
Correct Answer: ratio of true temperature difference to the LMTD.
Correct Answer: one fourth
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