Vacuum insulation is commonly used in vacuum circuit breakers, interrupters, and certain electronic tubes, but conventional power transformers use solid and liquid insulating materials rather than vacuum as the primary insulation.
Vacuum insulation is used in all of the following except
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Question context
This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.