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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 2
31.
The Graetz number is concerned with the
mass transfer between a gas and a liquid.
absorption with chemical reaction.
heat transfer in turbulent flow.
heat transfer in laminar flow.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Solid angle subtended by the finite surface at the radiating element is
called the view factor.
called the angle of vision.
proportional to the square of the distance between surfaces.
expressed in terms of radians.
Answer: Option
Explanation:
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33.
Pick out the wrong statement.
The emissivity of a surface decreases, if it gets corroded by atmospheric environment.
The emissivity of a surface increases with increase in surface roughness.
The emissivity of a polished surface is quite low.
The emissivity of a non-metallic surface decreases with increase in the temperature.
Answer: Option
Explanation:
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34.
In forced convection, the heat transfer depends on
Re, Pr
Re, Gr
mainly Gr
Re only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
With increase in temperature, the thermal conductivity of most liquids
increases
decreases
remains same
first increases upto a certain temperature and then becomes constant
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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