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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 10
16.
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.
extremely low
low
high
no
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is
11.2 kW/m2
12.0 kW/m2
14.6 kW/m2
16.5 kW/m2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Heat exchangers operating, when the asymptotic range is reached,
provide very large heat transfer co-efficient.
results in making part of the heating surface inactive.
results in abruptly increased velocity.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)
D/5 and D
D/2 and 2 D
D/4 and 2 D
D and 2 D
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.
geometric
arithmetic
logarithmic
either (a), (b) or (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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