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A 5 mm diameter steel ball of 30C is exposed to 500C furnace environment. The ball is heated to 130C in 5 min, the

A 5 mm diameter steel ball of 30C is exposed to 500C furnace environment. The ball is heated to 130C in 5 min, the time taken to heat the ball to 230C by taking that internal temperature gradients are neglected. (a) 3.45 min (c) 5.6 min (b) 4.67 min (d) 11.58 min

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