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Chemical Engineering - Heat Transfer - Discussion

Discussion Forum : Heat Transfer - Section 2 (Q.No. 33)
Heat Transfer
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:
No answer description is available. Let's discuss.
Discussion:
8 comments Page 1 of 1.
Afjal said:   9 months ago
For non-metallic surfaces, emissivity typically increases with an increase in temperature because such surfaces emit more radiation at higher temperatures.
Jan Marc S. Karganilla said:   1 year ago
why not B??
Naeem bangash said:   7 years ago
Explain the answer.
Rft said:   8 years ago
Please explain.
Darthvader said:   8 years ago
The correct answer is A.
Anonymous said:   9 years ago
Let us know what is right?
Akhilesh said:   9 years ago
Please tell me the right answer.
Ash said:   1 decade ago
Why can't the answer be D? Emissivity of any body increases with increase in temperature right?
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