engineering recuitment UPPSC AE Mock Test 2024 Heat Transfer Conduction Critical Thickness of Insulation
An electric cable 1.4 cm in diameter has to be insulated with rubber (thermal conductivity \(0.174\frac{W}{{mK}}\)). The cable is located in air where heat transfer coefficient is \(8.7\frac{W}{{{m^2}K}}\). The critical thickness of insulation is
1
2 cm
2
1.724 cm
3
1.3 cm
4
1.4 cm