10. A 400V, 3-phase, 4 – wire system supplies three (3) resistive load of 15kW, 20kW and 25kW in the red, yellow and blue phases respectively. Determine the currents flowing in each of the four (4) conductors. 18 Marks Total: 100 Marks
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- 9. What size THWN copper conductors are required to supply a 120/208V, three-phase panelboard with 20.5KVA of noncontinuous load and 25KVA of continuous load? a. 250 kcmil b. No. 1 C. 1/0 d. 4/017 In the figure shown, the voltage V1 the voltage V2 by V₁ * out of phase. 40)(a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary. 13. In performing the short circuit test of a trans- former (a) high voltage side is…
- A current is measured at the neutral ground of a star load, of equal impedances in all three phases. Which of the following conditions is NOT possible?A) The currents in the three phases are equal in magnitude and angle.B)One phase of the supply conductors was left in open circuit.C) The line-to-neutral voltages in the load are equal in magnitude and with 120° phase shifts between them.D) None of the aboveA 33 kV, 50 Hz. 3-phase underground cable, 6 km long uses three single core cables. Each of the conductor has a diameter of 2.75 cm and the radial thickness of insulation is 0.4 cm. Determine (1) capacitance of the cable/phase (ii) charging current/phase (iii) total charging KVAR. The relative permittivity of insulation is 3.Q1. In a 3-phase 4 wire, 400/230 system, a lamp of 100 watts is connected to one phase and neutral and a lamp of 150 watts is connected to the second phase and neutral. If the neutral wire is disconnected accidentally, what will be the voltage across each phase? Do you think it will affect their performance? Explain
- Problem 5 For two electrical system shown in Figure 5, use cyclic currents to derive a complete mathematical model for each of the electrical systems. Ri. Rz ca) Cz (6) ERZ RI12. What is the percentage load to added to a branch circuit conductor having an ampacity equal to or greater than the non-continuous load? a. 75 b. 80 c. 115 d. 125Determine the Branch Currents using Kirchhoff’s Laws: a.) Branch bd b.) Branch cd c.) Branch ca