A single phase transformer has a net core area of 60 sq cm. The primary having 400 turns is connected to a 550 V supply. What is the flux density in the core? The supply frequency is 60 Hz. In a 25KVA...

Extracted text: A single phase transformer has a net core area of 60 sq cm. The primary having 400 turns is connected to a 550 V supply. What is the flux density in the core? The supply frequency is 60 Hz. In a 25KVA single phase transformer the core loss and full load copper losses are respectively 320 and 380 Watts. A) What is the efficiency at half load and 0.866 power factor lagging? B) Determine the load in kVA in which the efficiency is maximum. A 19KVA transformer steps down from 3300V to 240V. The resistance of the primary and the secondary windings are 6 ohms and 0.04 ohms respectively and the reactances are 2.5 times the resistance in each case. Calculate the secondary terminal voltage when the transformer is delivering full load current at unity of. A 20KVA, 440/220v, single phase transformer has an iron loss of 324W. The copper loss is found to be 100W when delivering half load current. Determine its efficiency when delivering full load current at 0.8 lagging pf.