7. Three 100 Ω non-inductive resistances are connected in (a) star and (b) delta across a...
5 Three inductive coils each of inductance 45mH are connected in star to a 3 phase 400V, 50 Hz supply. Calculate the inductance of each coil, which when connected in delta to take the same supply voltage and line current, also find the power delivered at unity power factor for both star and delta connected load. (6 Marks)
please quickly Q=65 For each phase, the star connected load formed by the series connected elements whose values are Ry = 8Ω and Ly = 0.1H is connected to the star connected three phase voltage source with the line with the impedance Z = 3 + j5 Ω for each phase. What should be the effective value of the voltage source so that the load can absorb reactive power of total Q kVAr? What would be the tension at the...
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of impedances, each having a resistance of 10 Ω and an inductive reactance of 8 Ω Calculate the capacitance of delta-connected capacitors required to improve the overalil power factor to 0 95 lagging [14] TOTAL 1001
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system...
3- A balanced wye-connected load of (4 + j3) Ω is connected across a three-phase delta connected source. the source phase voltage is 173 V . • Find the load current. • Find the power factor, P and Q
A certain circuit consists of three resistors connected in parallel across 200V mains. The rate of production of heat in them is in the ratio of 5:3:2 and together they generate heat at the rate of 1 kWh in 2 h. Find the power used if the three resistances are connected in series across 248V mains. A 3-phase six pole, 60 hz, 230-V wound rotor motor has its stator connected in delta and its rotor connected in wye. The stator...
b) The load connected to a three-phase supply comprises three similar coils connected in star. If the phase currents are 10A and the total active power and power factor absorb by the loads are 3kW and 0.8 lagging, respectively. Find: i. The magnitude of phase and line voltages (4 marks) ii. Total apparent power (1 mark) iii. The impedance of each coil. (2 marks) c) If the coil in Q3(b) are now connected in delta to the same three-phase supply,...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
Two electrical loads are connected in parallel to a 380 V, 50 Hz, three phase supply. The first load consists of three identical impedance each 7 Ω resistance and 5Ω inductive resistance, connected in star. The second load consists of three identical impedances, each 12 Ω resistance and 8 Ω capacitive reactance connected in delta. Sketch the arrangement described above Calculate Zph1 and Zph2[Zph1= 8.6Ω 35.54°; Zph2= 14.42 Ω -33.69°] Determine Iph1 and Iph2[Iph1= 25.51A -35.54°; Iph2= 26.35A +33.69°] IL1...
A three-phase line, which has an impedance of (2 + j4) Ω per phase, feeds two balanced three-phase loads that are connected in parallel. One of the loads is Y- connected with an impedance of (30 + j40) Ω per phase, and the other is delta- connected with an impedance of (60 + j45) Ω per phase. The line is energized at the sending end from a 60-Hz, three phase, balanced voltage source of 120√3 V (rms, line- to-line). Determine...
Three resistors, 15.0 Ω, 23.0 Ω and R are connected across a 6.00 V battery. The current in the circuit is 0.100 A. (a) What is the resistance of the unknown resistor? (b) What is the voltage across each resistor? (c) What is the power used by each resistor?