What components are found in a dry-type transformer?

• A. A metering device
• B. Liquid-filled oil reservoir
• C. Iron core, primary coil, and secondary coil
• D. No windings

Answer: (C)

The main idea here is recognizing the basic components that make up a dry-type transformer. A dry-type transformer is built with a magnetic iron core and windings that form the primary and secondary circuits. The iron core provides the magnetic path that couples the energy between the coils, the primary coil connects to the power source, and the secondary coil delivers the transformed voltage to the load. Since this is a dry-type design, everything is solidly insulated and there is no liquid-filled oil reservoir, which distinguishes it from oil-filled transformers.

A metering device isn’t a fundamental transformer component; it’s external equipment used to monitor electrical parameters. A liquid-filled oil reservoir is characteristic of oil-immersed transformers, not dry-type. And without windings, there would be no way to transfer energy between the input and output, so that option doesn’t fit the concept of a transformer.