Question:-
A cylinder made of a metal of conductivity 40 W/(mK)is to be insulted with a material of conductivity 0.1 W/(mK). If the convective heat transfer coefficient with the ambient atmosphere is 5 W/(m2K), the critical radius of insulation is
Option (A)
2 cm
Option (B)
4 cm
Option(C)
8 cm
Option(D)
50 cm
Correct Option:
(A)
Question Solution:
For cylinder
Rc = (K/h0) = (0.1 /5) x 100 = 2cm
question-answer-faq-6092