Transmission Of Heat Question 72
Question: A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities K1 and K2. The equivalent conductivity of the combination is
[BHU 2001]
Options:
A) $ K _{1}+K _{2} $
B) $ \frac{K _{1}+K _{2}}{2} $
C) $ \frac{2K _{1}K _{2}}{K _{1}+K _{2}} $
D) $ \frac{K _{1}+K _{2}}{2K _{1}K _{2}} $
Show Answer
Answer:
Correct Answer: B
Solution:
In parallel combination equivalent conductivity $ K=\frac{K _{1}A _{1}+K _{2}A _{2}}{A _{1}+A _{2}}=\frac{K _{1}+K _{2}}{2} $ (As $ A _{1}=A _{2} $ )
BETA
