Question :
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.
1. in between 37 & 71%
2. < 37%
3. none of these
4. >71%
Answer :
1 - in between 37 & 71%
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