High purity nitrogen is used in__________________?
Correct answer: C. Both A. & B.
- A. Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
- B. Fire fighting purposes
- C. Both A. & B.
- D. Neither A. nor (B)
Explanation
Nitrogen is used as an inert protective atmosphere, including the 95% nitrogen and 5% hydrogen mixture for annealing steel coils. Its non-combustible nature also makes it useful in fire-control and fire-fighting systems, so both statements apply.
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