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What is the correct answer?
4
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be
A.
25 mm
B.
40 mm
C.
160 mm
D.
800 mm
Correct Answer :
A. 25 mm
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