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RVUNL ME|| Heat-Transfer || Quiz 1
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Question 1
With increase in temperature, thermal conductivity of air _________.
Question 2
A furnace is made of material whose wall of thickness 0.2 m and conductivity 0.4 W/mk. What is the thickness if it is replaced by a layer of another material of conductivity 0.8 W/mk under the same heat loss per unit area and same temperature drop ?
Question 3
Which of the following material has highest thermal conductivity?
Question 4
The temperature distribution associated with radial conduction through a sphere is represented by
Question 5
If a foam insulation is added to a 4cm outer diameter pipe as shown in the figure, the critical radius of insulation (in cm) is __________ .
Question 6
Equivalent resistance of the thermal circuit given in the figure _________.
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Aug 21AE & JE Exams
