An electric cable of aluminium conductor ( = 240 W/mK) is to be insula – McqOptions

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1.	An electric cable of aluminium conductor ( = 240 W/mK) is to be insulated with rubber ( = 0.15 W/mK). The cable is to be located in air ( = 6 W/m). The critical thickness of insulation will be
A.	25 mm
B.	40 mm
C.	160 mm
D.	800 mm
Answer» B. 40 mm

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