A 15 KVA, 2400: 240/120 V, 60 Hz, the two-winding transformer is to be reconnected as a 2400:2520 V step-up transformer. From test work on the two-winding transformer, it is known that its rated voltage core losses and coil losses are 280 and 300 W, respectively. For this autotransformer, (a) determine the apparent power rating and (b) the full-load efficiency if supplying 2520 V to a 0.8 PF lagging load.

A 5-kVA, 4.16kV/120-V, 60-Hz single-phase transformer has the following parameters as referred to the primary side: Re1 = 3 02, Xe1 = 422, Rc1 = 2.5 kn, and Xm1= 2 kn. The transformer is operating at full load with a power factor of 0.87 lagging. Determine the efficiency and the voltage regulation of the transformer. Use the approximate equivalent circuit as seen from the primary side given in Fig. 2. R₁₁ 110 000 jXml Ret jX₁1 000 Ī,- 1 a²2₁ V₂=av₂

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4.) A transformer has a primary coil with 300 windings, and secondary coil has 400 windings. The input AC power supply is 120 volts (Vrms). A) Is this a step-up or step-down transformer? B) What is the rms voltage across the output terminals (Vrms)? C) What is the peak voltage across the output terminals (Vmax)? Primary Secondary imm ac input