EEE4115 Electrical Engineering principle Assignment 1 Q1 A IKVA ideal single phase step-up transformer is supplied by a 24 V ac power source and is delivering power to a 10 resistive load connected to the secondary side. If the transformer is operated at full load (IkVA), determine, a) the secondary current Is; (3 marks) b) the secondary voltage Vs; (2 marks) c) the primary current Ip; (2 marks) d) the turn ratio of primary winding to secondary winding, and (2 marks) e) the number of turns of secondary winding if the primary winding coil contains 100 (2 marks) turns. Q2 02 Three electrical loads are connected in parallel and supplied by a single phase 220V, 50Hz ac power source as shown in figure Q2 2.3H 15000 220V SOHA 12W 0.9 leading 400 Load 1 Load 2 Load 3 Figure 02 a) Calculate the current lules, lo and is in phasor form (mark) b) Calculate the total real power. (5 marks) c) Calculate the total reactive power (5 marks) d) Calculate the apparent power delivered from the power source. (2 marks) e) Calculote the overall power factor 3 marks 1) A capacitor is connected in parallel with the power source so as to correct the power factor to 0.95 lagging Calculate the capacitance of the capacito (7 marks) 2) Calculate the root mean square value of new supply currently after power factor (4 marks) correction