Final Exam SMJE2103 201320141.pdf - SMJE 2103 QUESTION 1 Electrical energy is considered to be superior over others energy form likes pneumatic and

Final Exam SMJE2103 201320141.pdf - SMJE 2103 QUESTION 1...

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SMJE 2103 - 3 - QUESTION 1 Electrical energy is considered to be superior over others energy form likes pneumatic and hydraulic energies. Give 5 (five) facts that gives the proof for it. CO2/PO3[20 marks] QUESTION 2 Referring to the Figure 1, a balanced 120 V-rms wye-connected three-phase source with positive phase sequence is connected to two balanced three-phase loads connected in parallel. Load 1 (L1) is wye-connected with Z Y1 = (30 +j40) Ω and Load 2 (L2) is delta-connected with Z 2 = (60-j45) Ω. The line impedance per phase is Z line = (2+j4) Ω. Det ermine: a) the per phase line current. CO1/PO1[8 marks] b) the total real and reactive power drawn from the source. CO1/PO1[6 marks] c) the per phase line-to- neutral voltage across the parallel load. CO1/PO1[6 marks] Figure 1
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