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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 2
1.
Which area is used in case of heat flow by conduction through a cylinder ?
Logarithmic mean area
Arithmetic mean area
Geometric mean area
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place
between two bodies in physical contact with each other.
between two bodies not in physical contact with each other.
from one part of a body to the another part of the same body.
both 'b' & 'c'
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is
Nusselt number.
Sherwood number.
Schmidt number.
Stanton number.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Finned tube heat exchangers
give larger area per tube.
use metal fins of low thermal conductivity.
facilitate very large temperature drop through tube wall.
are used for smaller heat load.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.
increases
decreases
remains constant
may increase or decrease ; depends on the material
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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