Can a 50 Hz transformer be used as 25 Hz, if the input voltage is maintained constant at the rated corresponding to 50 Hz?

• A. Yes, since the voltage is constant, current levels will not change
• B. No, flux will be doubled which will drive the core to excessive saturation
• C. No, owing to decreased reactance of transformer, input current will be doubled at load
• D. Yes, at constant voltage, insulation will not be overstressed