The process of converting voltage up or down is called

• A. Stepping-down/Stepping-up
• B. Rectification
• C. Modulation
• D. Isolation

Answer: (A)

Voltage transformation is what’s being tested here. A transformer changes the voltage level of an alternating current by using the turns ratio between its primary and secondary windings. If the secondary has more turns, the voltage increases (step up); if it has fewer turns, the voltage decreases (step down). This is exactly why the process of converting voltage up or down is described as stepping up or stepping down.

Rectification would convert AC to DC, modulation would alter a carrier signal’s characteristics, and isolation refers to electrically separating circuits for safety. None of those describe changing the voltage level itself, whereas stepping up or stepping down captures the actual action of voltage transformation.