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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 11
16.
In Biot number, the characteristic length used is the ratio of the __________ of the solid.
volume to surface area
perimeter to surface area
surface area to volume
surface area to perimeter
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Which of the following is the most widely used heat insulating material for pipelines carrying steam ?
Tar dolomite bricks followed by asbestos.
Fireclay refractory followed by aluminium sheet.
Cotton followed by aluminium foil.
85% magnesia cement and glass wool.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re0.8 . Prn, is not valid, if the value of
n = 0.4 is used for heating.
n = 0.3 is used for cooling.
Reynolds number for the flow involved is > 10000.
Reynolds number for the flow involved is < 2100.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
Square pitch
Triangular pitch
Diagonal square pitch
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
is inversely proportional to the resistance across which the drop occurs.
and the wall are proportional to individual resistances.
and the wall is not related.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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