Which of the following is the black oxide of iron?

Dolerite is an example of ____ rock.

Which of the following is the lowest part of the blast furnace?

The reciprocal of thermal conductivity is known as ______

Thermal damping is given by the equation D = (T-t/T) x 100. Here, T denotes _____

Which variety of cast iron is obtained by melting cast iron with wrought iron scrap?

Which of the following statements about low shaft blast furnace is not true?

Which tool is used to make blast holes in the process of blasting?