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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 4
21.
Film boiling is usually not desired in commercial equipments, because
the heat transfer rate is low in view of the large temperature drop.
it is difficult to maintain.
it is not economic.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
3
0.33
1
1.33
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be
W/m.k
W/m
W/m.k2
none, 'a' is just a number
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Film condensation is promoted on a/an __________ surface.
oily
coated
clean & smooth
dirty
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Dietus-Boelter equation cannot be used for molten metals mainly due to its very low
Prandtl number
Grashoff number
thermal conductivity
viscosity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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