4031. In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon
baffle spacing
clearance
pitch
none of these
✅ The correct answer is option D.
Chemical Engineering
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4032. In inclined long tube vertical evaporators, the tubes are inclined at an angle of
15°
90°
45°
60°
✅ The correct answer is option C.
4033. In distillation columns, bubble caps are held in place over trays by
rivets
a hold down bar
bolts
both (b) and (c)
✅ The correct answer is option D.
4034. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.
1-May
20-40
100-150
1000-1500
✅ The correct answer is option B.
4035. In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a
clearance of 25-75 mm.
cap pitch of 1.3-2 times the cap diameter.
either ‘a’ or ‘b’.
neither ‘a’ nor ‘b’.
✅ The correct answer is option C.
4036. Which of the following material is seldom used for pressure vessel construction ?
Rimmed still
Mild steel
Killed steel
Semi-killed steel
✅ The correct answer is option A.
4037. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.
5
15
7.5
50
✅ The correct answer is option B.
4038. In the design of a shell and tube heat exchanger, the corrosion allowance
need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
for carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm.
for internal cover and tube sheet is provided on both the sides.
all (a), (b) & (c).
✅ The correct answer is option D.
4039. The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.
0.3 to 0.8
1.25 to 3.125
3.5 to 7.0
8-Dec
✅ The correct answer is option B.
4040. The maximum liquid gradient over a tray must not exceed
0.5″ -1.25″.
2″-3.5″.
5″.
half the tray spacing.
✅ The correct answer is option A.