Purity of electrical grade aluminium should be ≥ _____________ percent?
Correct answer: B. 99.5
- A. 95
- B. 99.5
- C. 85
- D. 90
Explanation
Electrical-grade aluminium must be highly pure so that impurities do not significantly increase electrical resistivity; a commonly specified minimum is 99.5% aluminium. Therefore, 99.5 is the appropriate choice.
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