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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 4
1.
The critical radius 'r' of insulation on a pipe is given by
r = 2k/h
r = k/h
r = k/2h
r = h/k
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the
temperature of the body only.
wavelength of monochromatic radiation.
both (a) and (b).
nature of material of body.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid
remains unchanged.
increases.
increases or decreases depending on number of shell passes.
decreases.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by
painting the surface black.
painting the surface white (with aluminium paint).
giving the surface a mirror finish.
roughening the surface.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
__________ paint has the maximum absorption coefficient.
Black
Yellow
White
Grey
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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