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Three single-phase transformers are sometimes used to connect to a 3-phase circuit but they are much more expensive to replace in the case of failure than a common-core 3-phase unit.

_____ is produced when an arc occurs under the liquid inside a transformer.

Mineral oil is subject to oxidation that degrades the oil and results in ___ buildup.

An insulation power factor value _____ is generally considered to be a sign of adequate insulation.

Transformer ___ protection is required to protect the primary windings from short circuits and overloads and the secondary windings from overloads.

A(n) ___ is a transformer that has all or part of the windings shared by the primary and secondary.

Transformers and transformer vaults shall be installed in locations that are ___ to qualified personnel.

The turns ratio is the ratio of the 10 min reading to the 1 min reading taken on a dielectric absorption test.

In general, the transformer enclosure for transformers installed outdoors shall be weatherproof and constructed so that exposure to weather does not interfere with transformer operation.

It is unnecessary to inspect and test a transformer before installation and before it is energized for the first time.