111. Height of the flights in the rotary drier is in the range of
0.08 to 0.12 d
0.02 to 0.05 d
0.2 to 0.5 d
0.5 to 0.6 d
✅ The correct answer is option A.
Process Equipment and Plant Design MCQs
112. In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)
Aa = Sa
1.2 Aa = 1.2 Sa
Sa = 1.5 Aa
Aa = 1.5 Sa
✅ The correct answer is option A.
113. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m2.°C.
1250
2500
7500
15000
✅ The correct answer is option C.
114. The buckling tendency of compression members is always in the direction of the
least radius of gyration.
axis of the load.
perpendicular to the axis of the load.
none of these.
✅ The correct answer is option A.
116. Pick out the wrong statement
In a flanged and standard dished head, the crown radius is ≤ shell outside diameter.
In a flanged and shallow dished head, the crown radius is > shell outside diameter.
Flat head covers are most suitable for larger vessels operating at very high pressure.
Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses.
✅ The correct answer is option C.
117. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT
decreases very rapidly
increases very rapidly
remains constant
increases linearly
✅ The correct answer is option A.
118. Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation.
Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps.
The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4.
none of these.
✅ The correct answer is option D.
119. Floating head heat exchangers are used for the
heat transfer between corrosive fluids.
cases where temperature difference between the shell and the tubes is more (>50°C).
co-current heat transfer systems.
counter-current heat transfer systems.
✅ The correct answer is option B.
120. Flanges are connected to pipes by
screwing
welding
brazing
all (a), (b) and (c)
✅ The correct answer is option D.