A furnace is made of a red brick wall of thickness 0.5 m and conductiv – McqOptions

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1.	A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness
A.	0.5 m
B.	0.1 m
C.	0.2 m
D.	0.5 m
Answer» C. 0.2 m

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