The critical radius of insulation for a spherical shell is

Question

TuteeHUB · Accepted Answer

$\frac{{{\rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{2 \times heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}$

TuteeHUB · Answer

$\frac{{{\rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}$

TuteeHUB · Answer

$\frac{{{2\times \rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}$

TuteeHUB · Answer

$\frac{{{\rm{heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}{{{\rm{thermal\;conductivity\;of\;insulating\;material}}}}$

1.	The critical radius of insulation for a spherical shell is
A.	\(\frac{{{\rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}\)
B.	\(\frac{{{2\times \rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}\)
C.	\(\frac{{{\rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{2 \times heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}\)
D.	\(\frac{{{\rm{heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}{{{\rm{thermal\;conductivity\;of\;insulating\;material}}}}\)
Answer» C. \(\frac{{{\rm{thermal\;conductivity\;of\;insulating\;materail}}}}{{{\rm{2 \times heat\;transfer\;coefficient\;at\;the\;outer\;surface}}}}\)

Discussion