alleryA well designed transformer may reach an efficiency of more than:
AThirty-five per cent
BNinety-five per cent
CSixty-five per cent
DFifty-five per cent
Answer & Solution
Correct answer: B. Ninety-five per cent
1. An ideal transformer would lose no energy at all.
2. Real ones lose a little to heating and leakage.
3. A well designed transformer may have an efficiency of more than 95%.
4. So the answer is more than ninety-five per cent.
_Source: syllabus Physics Part I, Ch 7 'Alternating Current'_
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