Q3. You are an Associate Professional working in the Faculty of Engineering and a newly appointed technician in the Mech

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Q3 You Are An Associate Professional Working In The Faculty Of Engineering And A Newly Appointed Technician In The Mech 1 (143.59 KiB) Viewed 27 times

Q3. You are an Associate Professional working in the Faculty of Engineering and a newly appointed technician in the Mechanical Workshop asks you to help him with a task he was given. The department recently purchased a new 3-phase lathe, and he is required to wire the power supply. The nameplate of the motor on the lathe indicated that it is delta connected with an equivalent impedance of (5+j15) 22 per phase. The workshop has a balanced star connected supply and you measured the voltage in phase A to be 230 Đ0⁰ V. (a) Discuss three (3) advantage of using a three phase supply as opposed to a single phase supply (6 marks) (b) Draw a diagram showing a star-connected source supplying a delta-connected load. Show clearly labelled phase voltages, line voltages, phase currents and line currents. (6 marks) (c) If this balanced, star-connected source is connected to the delta-connected load, calculate: i) The phase voltages of the load (4 marks) ii) The phase currents in the load (4 marks) iii) The line currents (3 marks) iv) The total apparent power supplied (2 marks) (Total 25 marks)