An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with

Question

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

Options:

A . 25 mm

B . 40 mm

C . 160 mm

D . 800 mm

Answer: Option A

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