किस ट्रांसफार्मर परीक्षण को सम्प्सनर परीक्षण (Sumpner's Test) भी कहा जाता है?

In which unit is the power rating of a transformer expressed?

In a transformer, it is generally preferred to wind the low-voltage winding close to the core and the high-voltage winding over the low-voltage winding. What is the primary advantage of this type of arrangement?