12.a. Comparing the transformer cores of core-form and shell-form transformers shows that the a. shell form provides lower reactance without increasing the transformer size. b. core form makes possible wider coils and better oil circulation. c. shell form is used exclusively in small low-voltage transformers. 12.b. Distribution transformers are generally protected from damage due to excessive internal temperatures, by the operation of a A. lightning arrester. B. circuit breaker. C. surge diverter.

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