Equal amounts of a liquid metal at the same temperature are poured into three moulds made of steel, copper and aluminium. The shape of the cavity is a cylinder with 15 mm diameter. The size of the moulds are such that the outside temperature of the moulds do not increase appreciably beyond the atmospheric temperature during solidification. The sequence of solidification in the mould from the fastest to slowest is(Thermal conductivities of steel, copper and aluminium are 60.5, 401 and 237 W/m-K, respectively.Specific heats of steel, copper and aluminium are 434, 385 and 903 J/kg-K, respectively.Densities of steel, copper and aluminium are 7854, 8933 and 2700 kg/m3, respectively.)

Equal amounts of a liquid metal at the same temperature are poured int

1.	Equal amounts of a liquid metal at the same temperature are poured into three moulds made of steel, copper and aluminium. The shape of the cavity is a cylinder with 15 mm diameter. The size of the moulds are such that the outside temperature of the moulds do not increase appreciably beyond the atmospheric temperature during solidification. The sequence of solidification in the mould from the fastest to slowest is(Thermal conductivities of steel, copper and aluminium are 60.5, 401 and 237 W/m-K, respectively.Specific heats of steel, copper and aluminium are 434, 385 and 903 J/kg-K, respectively.Densities of steel, copper and aluminium are 7854, 8933 and 2700 kg/m3, respectively.)
A.	Copper – Steel - Aluminium
B.	Aluminium – Steel - Copper
C.	Copper – Aluminium - Steel
D.	Steel – Copper - Aluminium
Answer» D. Steel – Copper - Aluminium

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