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8 Working in pairs test each other’s ability to speak about the
most frequent failure in electrical equipment.

9 Make questions that match the answers below.
1. The most frequent failure in electrical equipment is the
degradation and breakdown (flashover) of the insulation.
2. Electrical insulation can be liquid or solid, organic or
inorganic.
3. Organic insulation material consists of: enamels, varnishes,
resins, or polymers.
4. On air-cooled electrical machinery, the moisture content of the
air is very important.
5. On oil-cooled machinery, moisture can only be detected by
regular oil samples.
6. Special air dryers and absorbents can assist in decreasing the
rate the moisture is absorbed into the oil.

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