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What is the correct answer?
4
Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m
2
.k), when the insulation thickness is __________ mm.
A.
15
B.
25
C.
10
D.
30
Correct Answer :
B. 25
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