if k = thermal conductivity and h - heat
transfer coefficient then the critical thickness
of insulation for a cylinder, which will
maximise the heat transfer is equal to
यदि k = ऊष्मा चालकता तथा h = ऊष्मा स्थानान्तरण
गुणांक हो तो एक बेलन के लिए रोधन की क्रान्तिक
मोटाई जो ऊष्मा स्थानान्तरण की अधिकतम बनाएगी।
(Chattisgarh JE Paper-I 2008)
(a) k/h
(b) h/k
(c) 2k/h
(d) h/2k
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