If the regulatory tap setting on a single-phase transformer shifts from 100% to 97.5%, what happens to the secondary voltage?

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Multiple Choice

If the regulatory tap setting on a single-phase transformer shifts from 100% to 97.5%, what happens to the secondary voltage?

Explanation:
A regulator tap changes the effective number of turns on a winding, altering the voltage relationship between primary and secondary. For a transformer, the secondary voltage is Vs = (Ns/Np) × Vp. Moving the primary tap from 100% to 97.5% reduces the number of primary turns (Np decreases). With the same applied primary voltage, the turns ratio Ns/Np increases, so the secondary voltage rises. In short, lowering the tap raises the secondary voltage. The transformer’s kVA rating doesn’t change with tap settings; only the voltage changes.

A regulator tap changes the effective number of turns on a winding, altering the voltage relationship between primary and secondary. For a transformer, the secondary voltage is Vs = (Ns/Np) × Vp. Moving the primary tap from 100% to 97.5% reduces the number of primary turns (Np decreases). With the same applied primary voltage, the turns ratio Ns/Np increases, so the secondary voltage rises. In short, lowering the tap raises the secondary voltage. The transformer’s kVA rating doesn’t change with tap settings; only the voltage changes.

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