Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent. (A) < 37% (B) > 71% (C) In between 37 & 71% (D) None of these

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture.
It means that the blast furnace gas will explode when burnt in a confined
space, if its concentration in the gas-air mixture is __________ percent.
(A) < 37%
(B) > 71%
(C) In between 37 & 71%
(D) None of these
by

1 Answer

Answer :

(C) In between 37 & 71%
by

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__________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace. (A) Bauxite (B) Limestone (C) Quartz (D) Manganese

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Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag. (A) 2 (B) 3 (C) 0.8 (D) 6

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Blast furnace coke is made from coal by (A) Low temperature carbonisation (B) High temperature carbonisation (C) Medium temperature carbonisation (D) Heating the coal in an oven in presence of air

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