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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 2
36.
Heat transfer by __________ may not necessarily require the presence of a medium.
conduction
natural convection
forced convection
radiation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Pick out the correct statement.
Higher is the temperature of the radiating body, higher is the wavelength of radiation.
Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder.
The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature.
Solid angle subtended by the finite surface at the radiating element is called the angle of incidence.
Answer: Option
Explanation:
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38.
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
in low range of temperature differences.
in high range of temperature differences.
because of its low cost.
to prevent corrosion of the tube bundles.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Stefan-Boltzman law applies to __________ body.
black
white
grey
any colour
Answer: Option
Explanation:
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40.
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is
more
less
some
either more or less ; depends on the nature of vapor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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