The critical radius ' r ' of insulation on a pipe is given by

1.	The critical radius ' r ' of insulation on a pipe is given by
A.	r = 2 k / h
B.	r = k / h
C.	r = k /2 h
D.	r = h / k
Answer» C. r = k /2 h

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The critical radius ' r ' of insulation on a pipe is given by

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