Question

Solidification time of a casting will be more if

• A. Thermal diffusivity of the moulding sand is more
• B. None of the above
• C. Thermal conductivity of moulding sand is less
• D. Specific heats of molten metal and sand are low

Answer 1

The correct option is C Thermal conductivity of moulding sand is less

• For high thermal diffusivity, solidification time is less.

• For less specific heat of molten metal, solidification time will be less due to less heat storage capacity.

• Solidification time is high if thermal conductivity is less due to slow heat dissipation.