Correct option is D
1. Eddy Current Losses: These are losses due to circulating currents induced in the core of the transformer by the alternating magnetic field. Eddy current losses occur in the core material and are present regardless of the load condition.
2. Core Losses: Core losses, also known as iron losses, consist of hysteresis losses and eddy current losses. These losses occur in the transformer core and are constant regardless of the load on the transformer.
3. Copper Losses: Copper losses occur due to the resistance of the winding conductors when current flows through them. At full load, copper losses are at their maximum because the current through the windings is at its highest.
4. Friction Losses: In a transformer, friction losses are negligible or essentially zero because there are no moving parts. Friction losses are typically associated with mechanical systems involving rotating or sliding components, which are not present in a transformer.
Therefore, at full load, friction losses are zero because transformers do not have any mechanical moving parts that would cause friction losses.
