Answer in official key is “mechanical loss & iron loss ”.
Many times stray loss is also considered as total loss actually accured minus calculatable loss. This means loss that can be calculated is known as stray loss.
The rating of given on the name plate of a transformer indicates the:Apparent power which it can supply S=V( supplied voltage)*I (load current)
active power = v* i*cosφ
reactive power = v* i*sinφ