Process Equipment and Plant Design problems
- 1. 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
Correct Answer: 1.5-2.5
- 2. 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
Correct Answer: 10 to 20
- 3. 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
Correct Answer: ratio of true temperature difference to the LMTD.
- 4. 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
Correct Answer: one fourth
- 5. Stage efficiency for packed tower varies with the
Options- A. type & size of packing.
- B. fluid rates and fluid properties.
- C. operating pressure and column diameter.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 6. The raio,
is normally taken as
Options- A. 0.15-030
- B. 0.5-0.65
- C. 0.75-0.85
- D. 0.60-0.90 Discuss
Correct Answer: 0.15-030
- 7. The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the __________ stress.
Options- A. yield point
- B. breaking
- C. ultimate
- D. none of these Discuss
Correct Answer: ultimate
- 8. In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is
Options- A. called tube pitch.
- B. called tube clearance.
- C. always less than the diameter of the tube.
- D. none of these. Discuss
Correct Answer: called tube pitch.
- 9. A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design
Options- A. only if the opening is on spherical vessel.
- B. only if the opening is on a vertical cylinderical vessel.
- C. only if the opening is on a horizontal cylinderical vessel.
- D. irrespective of the shape of the vessel. Discuss
Correct Answer: irrespective of the shape of the vessel.
- 10. Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as
Options- A. 0.01
- B. 0.3
- C. 0.75
- D. 0.95 Discuss
Correct Answer: 0.3
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