Which code corresponds to the description 'Home signal light transformer'?

• A. KE
• B. HGT
• C. HV
• D. HY

Answer: (B)

In signaling codes, three-letter abbreviations pick up the main parts of a device: where it is or what type it is, the light element, and the power component. For a Home signal light transformer, the standard code is HGT because H stands for the Home signal, G represents the light element (globe/lamp) used, and T stands for the Transformer that powers the light. This combination directly encodes all three aspects of the description.

Other codes don’t reflect all parts of the description—they either omit the light element or the transformer, so they don’t uniquely match the phrase “Home signal light transformer.”