Question
Physics Question on Critical Thickness of Insulation
A hollow cylindrical pipe is insulated using asbestos insulation (k = 0.15 W/mK). If outside heat transfer coefficient is 75 W/m2K, then critical radius of insulation is:
A
0.5 cm
B
0.4 cm
C
0.2 cm
D
0.45 cm
Answer
0.2 cm
Explanation
Solution
The correct option is (C): 0.2 cm