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A rubber insulated copper wire 2 mm diameter is carrying electric current and exposed to a uniform temperature of air at 40°C. What will be the maximum steady current in amperes that can be allowed if the rubber insulation is not to get heated above 45°C? Insulation thickness=1 mm Thermal conductivity of rubber= 0.15 W/m-K Air film coefficient= 10 W/m2-K Electrical resistivity of copper=10/ ohm-m A 10.45 A B 2.1 A C) 14.5 A D 4.25 A E 9.65 A F None of these

A rubber insulated copper wire 2 mm diameter is carrying electric current and exposed to a uniform temperature of air at 40°C. What will be the maximum steady current in amperes that can be allowed if the rubber insulation is not to get heated above 45°C? Insulation thickness=1 mm Thermal conductivity of rubber= 0.15 W/m-K Air film coefficient= 10 W/m2-K Electrical resistivity of copper=10/ ohm-m A 10.45 A B 2.1 A C) 14.5 A D 4.25 A E 9.65 A F None of these

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A rubber insulated copper wire 2 mm diameter is carrying electric current and exposed to a uniform temperature of air at 40°C. What will be the maximum steady current in amperes that can be allowed if the rubber insulation is not to get heated above 45°C? Insulation thickness=1 mm Thermal conductivity of rubber= 0.15 W/m-K Air film coefficient= 10 W/m2-K Electrical resistivity of copper=10-7 ohm-m A 10.45 A В 2.1 A C) 14.5 A D 4.25 A E 9.65 A F None of these
Transcribed Image Text:A rubber insulated copper wire 2 mm diameter is carrying electric current and exposed to a uniform temperature of air at 40°C. What will be the maximum steady current in amperes that can be allowed if the rubber insulation is not to get heated above 45°C? Insulation thickness=1 mm Thermal conductivity of rubber= 0.15 W/m-K Air film coefficient= 10 W/m2-K Electrical resistivity of copper=10-7 ohm-m A 10.45 A В 2.1 A C) 14.5 A D 4.25 A E 9.65 A F None of these
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