-B- An electric cable of 20 mm in diameter and L=1m is to be insulated with plastic (k=0.175W/m.K). The cable is found in atmosphere at 30°C with h=9.3 W/m .K. If the cable surface temperature must be kept constant with and without insulation at 70°C. Then: 1-Find the heat transfer without the insulation and the temperature at the centre of wire if the thermal conductivity of wire is 400 W/m.K. 2-Find the maximum heat transfer with the insulation and the thickness needed. 3-Find the percentage increase in carrying capacity of electric current when using the rubber insulation.

-B- An electric cable of 20 mm in diameter and L=1m is to be insulated with plastic (k=0.175W/m.K). The cable is found in atmosphere at 30°C with h=9.3 W/m .K. If the cable surface temperature must be kept constant with and without insulation at 70°C. Then: 1-Find the heat transfer without the insulation and the temperature at the centre of wire if the thermal conductivity of wire is 400 W/m.K. 2-Find the maximum heat transfer with the insulation and the thickness needed. 3-Find the percentage increase in carrying capacity of electric current when using the rubber insulation.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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