What percent change per tap setting applies to the old system described?

• A. 2.5% per tap setting on the new xmr
• B. 4.5% per tap setting on the old system
• C. 3% per tap setting
• D. 5% per tap setting

Answer: (B)

Tap settings in a voltage regulation device define how much the output voltage moves with each step. In the older system described, each tap adjustment changes the output by 4.5% of the nominal voltage, so that is the per-tap change you’d expect for the old setup. The newer xmr system uses a smaller step of 2.5% per tap, which is why that value applies to the new design, not the old one. The other options don’t match the described old system’s behavior.