Relative to the number of turns of a secondary winding of a step-up transformer, what will be the number of turns of a primary winding?

Correct Answer: Option A — the primary winding will have fewer turns than the secondary winding

Transformer voltage transformation ratio is directly proportional to the turn ratio. A step-up transformer increases voltage, requiring the secondary winding to possess more turns than the primary winding, meaning the primary must have fewer turns.