Question:-
A steam pipe is covered two layers of insulating materials, with the better insulating material forming the outer part. If the two layers are interchanged, the heat conducted
Option (A)
Will decrease
Option (B)
Will increase
Option(C)
Will remain unaffected
Option(D)
may increase or decrease depending upon the thickness of each layer
Correct Option:
(A)
Question Solution:

K1 < K2 [K1 better insulator]
qa(K.A.ΔT/b)
qak. This means that the material having better insulating material should be inside to minimize the heat flux. If higher ‘K’ material then q more and once it traverses the inside layer it must pass through outer layer
question-answer-faq-3064