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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 10
26.
Which of the following has the minimum absorptivity ?
Aluminium foil
Coal dust
Refractory bricks
Iron plates
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
A black body when hot, emits heat radiation of __________ wavelengths.
small
large
all
one fixed
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when
CPA > CPB
CPA < CPB
kA < 0.5kB
kA>2 kB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the
flow of fluid on the tube and shell sides.
oscillations in the flow of shell/tube sides fluid.
vibrations transmitted through piping and/or supports due to external reasons.
all (a), (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is
0.2
0.4
0.6
0.8
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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