During heat treatment, cylindrical pieces of 25 mm diameter, 30 mm height and at

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During heat treatment, cylindrical pieces of 25 mm diameter, 30 mm height and at 30 degree Celsius are placed in a furnace at 750 degree Celsius with convective coefficient 80 W/m² degree. Find the value of biot number if thermal conductivity is 40 W/m degree

Options:

A . 0.0082

B . 0.0072

C . 0.0062

D . 0.0052

Answer: Option A
Answer: (a).0.0082

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