During heat treatment, cylindrical pieces of 25 mm diameter, 30 mm he – McqOptions

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1.	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
A.	0.0082
B.	0.0072
C.	0.0062
D.	0.0052
Answer» B. 0.0072

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