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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 5
36.
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.
hyperbolic
parabolic
linear
logarithmic
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred
through a metallic wall.
by direct contact of hot flue gas with air.
by heating an intermediate material (like chequor bricks) and then heating the air from this hot material.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
__________ equation relates the thermal conductivity of a solid to its temperature.
Antonie
Kopp's
Lee's
Kistyakowski
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)
Δt
Δt2
Δt3
Δt
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Pick out the wrong statement.
The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation.
Film co-efficient for vaporisation decreases as a result of vapor binding.
In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile liquid and is to be transferred for storage.
Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film co-efficient, which is higher.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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