1. The emf per turn for a single phase 2310/220 V, 50 Hz transformer is approximately 13 volts. Calculate (a) the number of turns in primary and secondary, and (b) the net cross sectional area of the core, for a maximum flux density of 1.4 T. 2. (a) A 2200/220 V, 50 Hz, 1- transformer has exciting current of 0.6 A and a core loss of 361 W, when its HV side is energized at rated voltage. Calculate the two components of the exciting current. (b) If the transformer of part (a), supplies a load current of 60 A at 0.8 p.f. lag on its LV side, then calculate the primary current and its p.f. Ignore leakage impedance drop. 3. The following data were obtained on a 2 kVA, 50 Hz, 2000/200 V distribution transformer. Draw the approximate equivalent circuit of the transformer referred to the HV and LV sides respectively. OC Test with HV open SC test with LV short Voltage (V) Current (A) Power (W) 200 60 4 10 120 300 4. A 1 source, equivalent to 16 V with internal resistance of 2 ks, feeds a resistive load of 802 through an ideal transformer. Calculate the turns ratio of the transformer so that maximum power is transferred to load. Under the conditions of maximum power transfer, calculate (a) load voltage across 80 2, (b) load current on the secondary side, (c) power delivered to load, (d) power delivered by source and efficiency.