Question

_________ is used for insulation in Pit furnaces.

(a) Polymer fiber

(b) Ceramic fiber

(c) Metal matrix reinforced fiber

(d) Plastic fiber

The question was asked by my school principal while I was bunking the class.

My question is from Gas Fired Pit Furnace in section Melting Furnaces of Foundry and Forging

Answer 1

Right option is (b) Ceramic fiber

For explanation I would say: The ceramic fiber is lined inside the furnace body. The insulation is provided to save the heat from going out. It acts as an energy saving shield and reduces operation costs.