three coins each having a resistance 20 ohm and reactance of 15ohm are connected in star to a 400v 3phase 50hz calculate line current and power supplied
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Explanation:
Three identical coils, each having a resistance of 20 ohms and a reactance of 15 ohms, are connected in star to a 400 V, three-phase, 50 Hz supply. Calculate: (a) The line current; (b) The power supplied (c) The power factor. Ans: 9.24A; 5.12kW; 0.8 lagging) 5. If in Q5, three identical capacitors are connected in delta to the same supply such that they are in parallel with the load, calculate (a) The capacitance required to give a resultant power factor of 0.95 lagging: (b) The line current taken by the combined circuit. Assume capacitors are lossless.+ (Ans: 14.3 uF; 7.78A) 6. 7. Repeat Q5 with the coils connected to the 400 V three-phase supply in delta. -' (Ans: 27.7A; 15.36kW; 0.8; 11.00kW; 4.36kW) 8. Non-reactive loads of 10,6 and 4 kW are connected between the neutral and the 'R', 'Y' and 'B' phases respectively of a 400 V, three-phase, 4-wire system. Find the current in each line conductor and the neutral. Assume phase sequence R-Y-B. - Ans: 43.3A; 26.0A; 17.3A; 22.9A) 9. Repeat Q8 if the constant impedance loads are connected across phases R-Y, Y-B and B-R respectively of a 400 V, three-phase 3-wire system. (Ans: 162.3A; 181.9A; 113.3A) 10. A star-connected load comprising two resistors and a pure inductor of the same numerical impedance are connected to a symmetrical three-phase supply. Find the voltage across each branch as a percentage of the line voltage. (Ans: 23.2%,86.4%; 77.5%)- 11. A 346/200 V, 50 Hz, 3-phase, 4-wire supply is delivering power to a 10 kVA, three-phase induction motor at a power factor of 0.75 lagging. There is also a 1.5 kW single-phase unity power factor load connected to phase 'A'. Calculate the phase 'A' line current.+ Ans: 22.84A)
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