4111. 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.
Chemical Engineering
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4112. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line)
S1/S2
S1.S2
S2/S1
1/S1.S2
✅ The correct answer is option A.
4113. The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.
equal to
more than
less than
either (b) or (c); depends on maximum permissible internal pressure
✅ The correct answer is option B.
4114. What is the value of ‘q’ for saturated liquid feed to a distillation column ?
0
<1
1
>1
✅ The correct answer is option C.
4115. Thickness of the frame of a plate and frame filter as compared to that of plates is
less
same
more
either (a) or (b)
✅ The correct answer is option C.
4116. Flanges are connected to pipes by
screwing
welding
brazing
all (a), (b) and (c)
✅ The correct answer is option D.
4117. A pressure vessel is said to be made of ‘thick’ shell, if the ratio of its diameter to wall thickness is
10
10
20
20
✅ The correct answer is option A.
4118. What is the slope of the operating line in the rectifying section of a distillation coloumn ?
0
∞
> 1
<1
✅ The correct answer is option D.
4119. Oxygen carrying pipelines in chemical industries are coloured with __________ colour.
yellow
black
blue
red
✅ The correct answer is option C.
4120. In case of design of a shell and tube heat exchanger,
minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch.
minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter.
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres.
all (a), (b) & (c).
✅ The correct answer is option D.