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. Calculate the time required to heat the pieces to 600 degree Celsius. Assume the following property values
Density = 7850 kg /m³
Specific heat = 480 J/kg K
Conductivity = 40 W/m degree

Options:

A . 226 sec

B . 326 sec

C . 426 sec

D . 526 sec

Answer: Option B
Answer: (b).326 sec

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