Which item is NOT a dry-type transformer?

Which item is NOT a dry-type transformer?

• A. Iron core
• B. Primary coil
• C. Secondary coil
• D. A metering device

Answer: (D)

Dry-type transformers are built around an iron core with windings, specifically the primary and secondary coils, all designed to operate in a dry insulation environment. A metering device, by contrast, is equipment used to measure electrical quantities such as voltage, current, or power, and it is not a component of a transformer. Since a metering device isn’t part of the transformer's construction, it is the item that is not a dry-type transformer.

Dry-type transformers are built around an iron core with windings, specifically the primary and secondary coils, all designed to operate in a dry insulation environment. A metering device, by contrast, is equipment used to measure electrical quantities such as voltage, current, or power, and it is not a component of a transformer. Since a metering device isn’t part of the transformer's construction, it is the item that is not a dry-type transformer.