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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 8
36.
Rate of crystallisation does not depend upon the
extent of supersaturation.
turbulence within the solution.
number and active surface area of the crystals.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Stefen's block body radiation law can also be derived from __________ law.
Kirchoffs
Planck's
Fourier's
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Multipass heat exchangers are used
because of simplicity of fabrication.
for low heat load.
to obtain higher heat transfer co-efficient and shorter tube.
to reduce the pressure drop.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,
the cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant.
both the spheres will emit equal amount of radiation per unit time in the beginning.
both will absorb equal amount of radiation from the surrounding in the beginning.
both(b) & (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2 .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the
higher condensing film co-efficient is desired.
condensate is corrosive in nature.
lower pressure drop through the exchanger is desired.
temperature of the incoming vapor is very high.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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