Q1: Material of construction of foundary crucible is

ANS:C - graphite

The material of construction of a foundry crucible is typically graphite. Graphite crucibles are commonly used in foundries for melting and pouring metals such as aluminum, brass, bronze, and cast iron. Graphite offers several advantages for this application, including high thermal conductivity, resistance to thermal shock, and chemical inertness at high temperatures. Additionally, graphite crucibles can withstand the corrosive effects of molten metals and maintain their shape and integrity even at elevated temperatures. Therefore, graphite crucibles are widely preferred for foundry applications due to their durability and suitability for handling molten metals.