241. Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.
10
20
30
5
✅ The correct answer is option C.
Process Equipment and Plant Design MCQs
242. The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
0.1-0.2
0.2-0.5
0.4-0.9
1.2-1.5
✅ The correct answer is option C.
243. In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σn are related by
σh = 2 σL
σh = σL
σh = σL/2
no relation exists
✅ The correct answer is option A.
244. An adequate clearance between the tray and the shell wall of a distillation column is provided to
drain the liquid from the tray when the unit is not in operation.
allow for thermal expansion and facilitate installation.
avoid back-trapping.
none of these.
✅ The correct answer is option B.
245. Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency
increases
decreases
remains same
may increase or decrease depending upon the plate spacing
✅ The correct answer is option A.
246. Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
2.5″
0.5″
5″
50% of the plate spacing
✅ The correct answer is option B.
247. For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter ).
1/D
1/D2
1/D5
D2
✅ The correct answer is option C.
248. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the
central dished section and corner torus section.
corner torus section and central dished section.
central dished section and straight flange section.
straight flange section and corner torus section.
✅ The correct answer is option A.
249. Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger
permits the use of less tubes in a given shell diameter.
facilitates comparatively easier external cleaning because of large clearance.
permits the use of more tubes in a given shell diameter.
both (b) and (c).
✅ The correct answer is option C.
250. In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D1 and D2 are I.D. of inner and outer pipes)
D2 – D1
none of these
✅ The correct answer is option A.