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Que. A cable of 10 mm outside is to be laid in an atmosphere of 25 degree Celsius (h = 12.5 W/m² degree) and its surface temperature is likely to be 75 degree Celsius due to heat generated within it. How would the heat flow from the cable be affected if it is insulated with rubber having thermal conductivity k = 0.15 W/m degree?
a. 43.80 W per meter length
b. 53.80 W per meter length
c. 63.80 W per meter length
d. 73.80 W per meter length
Correct Answer:53.80 W per meter length
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