ANS:C - cast iron

The product out from a cupola furnace is called cast iron. A cupola furnace is a type of melting furnace used primarily in foundries for melting cast iron. In the cupola furnace, coke (or charcoal) and limestone are loaded into the furnace from the top, along with scrap iron or iron ore. The heat generated by burning coke melts the iron ore, and the limestone helps to remove impurities from the molten iron. The molten iron collected at the bottom of the cupola is then tapped out, and it solidifies into a form known as cast iron. Cast iron is a ferrous alloy containing more than 2% carbon, along with silicon and other alloying elements. It has a relatively high carbon content compared to other forms of iron and is known for its excellent casting properties, including good fluidity when molten and excellent machinability after solidification. Therefore, the product out from a cupola furnace is called cast iron.