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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 2
11.
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it
occupies smaller space.
is more economical.
is easy to operate and maintain.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Out of the following four assumptions used in the derivation of the equation for LMTD , which one is subject to the largest deviation in practice ?
Constant overall heat transfer co-efficient.
Constant rate of fluid flow.
Constant specific heat.
No partial phase change in the system.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because
convection becomes important
conduction becomes important
radiation becomes important
sub-cooled boiling occurs
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow. )
t
1/ρ
1/A
all (a), (b) & (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Temperature profile in steady state heat transfer is
asymptotic
hyperbolic
parabolic
linear
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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