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Metallurgical Engineering Physical Metallurgy Difficulty: Medium

The critical nucleus size (in mm) when copper melt is under-cooled by 100K is Given data: Melting point: 1356 K Density: 8900 kg.m -3 Solid-liquid interfacial energy: 0.5 Jm -2 Latent heat of freezing: 13000 J. mol -1 Molar volume: 7 × 10 -6 m 3 mol -1

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Fick's first law relates Which of the following is true for metals? For ideal defect free deep drawability of material, it should have Steels with high carbon equivalent have poor weldability because in these steels during welding For the reaction, A = X + Y, the respective concentrations are C A , C X and C Y . The forward reaction rate constant is kf and the backward reaction rate constant is kb. Choose the correct statement from the following: P. At equilibrium, kf C A > k B CxCy Q. If the reaction is irreversible than, kb C X C Y = 0 R. The backward reaction rate will essentially be first order, if the forward reaction rate is first order. S. Activation energy for the first order forward reaction will be independent of temperature.