An electric cable, 8mm in diameter is covered by plastic sheathing . The surface temperature of cable was observed as 500 C when it is exposed to air at 200 C with convection coefficient of h=12.0 ....

An electric cable, 8mm in diameter is covered by plastic sheathing

. The surface

temperature of cable was observed as 500

C when it is exposed to air at 200

C with convection

coefficient of h=12.0

Calculate

(i) the thickness of insulation to keep the wire as cool as possible, and

(ii) surface temperature of insulated cable, if the intensity of current flowing the conductor

remains unchanged.

Sep 13, 2022

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