Which of these statements is FALSE with respect to transformers?

The statement regarding the operation of electronic and magnetic transformers being controlled by the same dimmers is indeed false. This is primarily due to the differences in how these two types of transformers operate and the technologies they use.

Electronic transformers typically employ a high-frequency switching method to transform power, while magnetic transformers work using electromagnetic induction at the line frequency (50/60 Hz). This fundamental difference in operation leads to different requirements for dimming capabilities. Many dimmers designed for magnetic transformers may not be compatible with electronic transformers, which can result in flickering, buzzing, or even damage to the transformer or the dimmer. Therefore, using the same dimmers for both types is not feasible across the board.

The other statements highlight characteristics that are part of the established knowledge of electrical transformers. Electronic transformers are indeed quieter than their magnetic counterparts because their operation can produce less audible noise, often due to the absence of physical components like coils and cores that vibrate. Additionally, electronic transformers generally run cooler than magnetic ones because they are more efficient, converting a higher percentage of electrical energy into usable power without excessive heat production.