GATE 2025 Mechanical Engineering Q33

Question

During a welding operation, thermal power of 2500 W is incident normally on a metallic surface. As shown in the figure below (figure is NOT to scale), the heated area is circular. Out of the incident power, 85% of the power is absorbed within a circle of radius 5 mm while 65% is absorbed within an inner concentric circle of radius 3 mm. The power density in the shaded area is ________ W mm⁻² (rounded off to 2 decimal places).

Accepted Answer

9.92 to 9.98