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     EduGorilla 
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    A steel tube having inner radius 1 cm and outer radius 2.5 cm is covered with asbestos of thickness 3cm. the temperature difference between the outer surface of asbestos and inner surface of steel is 600. . Calculate the heat transfer rate per unit length of the pipe in W/m

    Options :-

    1. 639
    2. 944.7
    3. 569.45
    4. 698.36
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