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

Dolerite is an example of ____ rock.

Presence of moisture in the thermal insulating material increases thermal insulation while the presence of air spaces de…

The use of explosives in order to convert rocks into small pieces of stones is done in _______

Which of the following is the black oxide of iron?

Which of the following qualities is not possessed by the filters in the air conditioning system?

Remelting of pig iron with limestone and coke to manufacture cast iron is carried out in a ________

Small amounts of _________ and ______ improve the quality of Bessemer pig.