8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers.
4 : 1 to 8 : 1 for liquid-liquid exchanger.
< 4 : 1 for gas-gas exchangers.
both(b) & (c).
✅ The correct answer is option D.
Process Equipment and Plant Design MCQs
212. In perforated plate towers, the
hole sizes may be around 1/8″ or 3/16″.
total hole area may be around 6 to 15% of tower cross-sectional area.
pressure drop is less compared is similar bubble cap towers.
all (a), (b) and (c).
✅ The correct answer is option D.
213. 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
0.5 d
d
1.5 d
2.5 d
✅ The correct answer is option C.
214. In chemical process equipments, the conical bottom heads used, usually has an apex angle of
20°
40°
60°
80°
✅ The correct answer is option C.
215. The most common standard size of bubble caps used in industrial operation is
1″ dia cap with 0.5″ dia riser.
6″ dia cap with 4″ dia riser.
8″ dia cap with 1″ dia riser.
4″ dia cap with 8″ dia riser.
✅ The correct answer is option B.
216. 1.2 to 3.8 cms is the value of the
downcomer liquid seal in case of a balanced tray design.
static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.).
skirt clearance for bubble caps.
all (a), (b) and (c).
✅ The correct answer is option D.
217. The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.
shear
tensile
compressive
thermal
✅ The correct answer is option D.
218. Longitundinal stress induced in a thin walled cylindrical storage vessel is
✅ The correct answer is option B.
219. Reflux ratio variation in a distillation column is between
zero and infinity
zero and one
minimum and infinity
none of these
✅ The correct answer is option C.
220. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter
increases
decreases
remain unaffected
none of these
✅ The correct answer is option B.