ECE 285/286:FUND ELCT CIRCUITS(LL)WACC
17th Edition
ISBN: 9781260270334
Author: Alexander
Publisher: MCG CUSTOM
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Chapter 12, Problem 5RQ
To determine
Choose the correct option to check whether the statement “line current and phase current are equal in a
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A 3-phase 415, 50Hz supply is given to delta connected load with impedance (6+j14) ohms. The line current is
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:A three-phase, three-wire, ABC system has effective line voltage 173.2 V. Wattmeters in lines A and B read -301 W and 1327 W, respectively. Find the impedance of the balanced Y-connected load. (Answer 10 angle -70° )
Chapter 12 Solutions
ECE 285/286:FUND ELCT CIRCUITS(LL)WACC
Ch. 12.2 - Given that Vbn=22030V, find Van and Vcn, assuming...Ch. 12.3 - A Y-connected balanced three-phase generator with...Ch. 12.4 - One line voltage of a balanced Y-connected source...Ch. 12.5 - A positive-sequence, balanced -connected source...Ch. 12.6 - In a balanced -Y circuit, Vab=44015 and ZY = (12 +...Ch. 12.7 - For the Y-Y circuit in Practice Prob. 12.2,...Ch. 12.7 - Calculate the line current required for a 30-kW...Ch. 12.7 - Assume that the two balanced loads in Fig....Ch. 12.8 - The unbalanced -load of Fig. 12.24 is supplied by...Ch. 12.8 - Find the line currents in the unbalanced...
Ch. 12.9 - Prob. 11PPCh. 12.9 - For the unbalanced circuit in Fig. 12.32, use...Ch. 12.10 - Repeat Example 12.13 for the network in Fig. 12.24...Ch. 12.10 - Let the line voltage VL = 208 V and the wattmeter...Ch. 12.10 - If the load in Fig. 12.35 is delta-connected with...Ch. 12 - What is the phase sequence of a three-phase motor...Ch. 12 - If in an acb phase sequence, , then Vcn is:Ch. 12 - Which of these is not a required condition for a...Ch. 12 - Prob. 4RQCh. 12 - Prob. 5RQCh. 12 - In a Y-Y system, a line voltage of 220 V produces...Ch. 12 - In a - system, a phase voltage of 100 V produces a...Ch. 12 - When a Y-connected load is supplied by voltages in...Ch. 12 - Prob. 9RQCh. 12 - Prob. 10RQCh. 12 - If Vab = 400 V in a balanced Y-connected...Ch. 12 - What is the phase sequence of a balanced...Ch. 12 - Given a balanced Y-connected three-phase generator...Ch. 12 - A three-phase system with abc sequence and VL =...Ch. 12 - For a Y-connected load, the time-domain...Ch. 12 - Using Fig. 12.41, design a problem to help other...Ch. 12 - Obtain the line currents in the three-phase...Ch. 12 - In a balanced three-phase Y-Y system, the source...Ch. 12 - A balanced Y-Y four-wire system has phase voltages...Ch. 12 - For the circuit in Fig. 12.43, determine the...Ch. 12 - In the Y- system shown in Fig. 12.44, the source...Ch. 12 - Using Fig. 12.45, design a problem to help other...Ch. 12 - In the balanced three-phase Y- system in Fig....Ch. 12 - Obtain the line currents in the three-phase...Ch. 12 - The circuit in Fig. 12.48 is excited by a balanced...Ch. 12 - A balanced delta-connected load has a phase...Ch. 12 - A positive sequence wye-connected source where ,...Ch. 12 - If Van = 22060 V in the network of Fig. 12.49,...Ch. 12 - For the - circuit of Fig. 12.50, calculate the...Ch. 12 - Prob. 20PCh. 12 - Three 440-V generators form a delta-connected...Ch. 12 - Find the line currents IaA, IbB, and IcC in the...Ch. 12 - A balanced delta connected source is connected to...Ch. 12 - A balanced delta-connected source has phase...Ch. 12 - In the circuit of Fig. 12.54, if , , , find the...Ch. 12 - Using Fig. 12.55, design a problem to help other...Ch. 12 - A -connected source supplies power to a...Ch. 12 - The line-to-line voltages in a Y-load have a...Ch. 12 - A balanced three-phase Y- system has V rms and Z =...Ch. 12 - In Fig. 12.56, the rms value of the line voltage...Ch. 12 - A balanced delta-connected load is supplied by a...Ch. 12 - Design a problem to help other students better...Ch. 12 - A three-phase source delivers 4.8 kVA to a...Ch. 12 - A balanced wye-connected load with a phase...Ch. 12 - Three equal impedances, 60 + j30 each, are...Ch. 12 - A 4200-V, three-phase transmission line has an...Ch. 12 - The total power measured in a three-phase system...Ch. 12 - Given the circuit in Fig. 12.57 below, find the...Ch. 12 - Find the real power absorbed by the load in Fig....Ch. 12 - For the three-phase circuit in Fig. 12.59, find...Ch. 12 - A balanced delta-connected load draws 5 kW at a...Ch. 12 - A balanced three-phase generator delivers 7.2 kW...Ch. 12 - Refer to Fig. 12.48. Obtain the complex power...Ch. 12 - A three-phase line has an impedance of 1 + j3 per...Ch. 12 - A balanced wye-connected load is connected to the...Ch. 12 - A three-phase load consists of three 100-...Ch. 12 - The following three parallel-connected three-phase...Ch. 12 - A balanced, positive-sequence wye-connected source...Ch. 12 - Each phase load consists of a 20- resistor and a...Ch. 12 - A balanced three-phase source with VL = 240 V rms...Ch. 12 - Consider the wye-delta system shown in Fig. 12.60....Ch. 12 - A four-wire wye-wye circuit has...Ch. 12 - Using Fig. 12.61, design a problem that will help...Ch. 12 - A balanced three-phase Y-source with VP = 880 V...Ch. 12 - A three-phase supply, with the line-to-line...Ch. 12 - Using Fig. 12.63, design a problem to help other...Ch. 12 - Determine the line currents for the three-phase...Ch. 12 - Solve Prob. 12.10 using PSpice or MultiSim. For...Ch. 12 - The source in Fig. 12.65 is balanced and exhibits...Ch. 12 - Use PSpice or MultiSim to determine Io in the...Ch. 12 - Given the circuit in Fig. 12.67, use PSpice or...Ch. 12 - Using Fig. 12.68, design a problem to help other...Ch. 12 - Use PSpice or MultiSim to find currents IaA and...Ch. 12 - For the circuit in Fig. 12.58, use PSpice or...Ch. 12 - A balanced three-phase circuit is shown in Fig....Ch. 12 - A three-phase, four-wire system operating with a...Ch. 12 - As shown in Fig. 12.72, a three-phase four-wire...Ch. 12 - Meter readings for a three-phase wye-connected...Ch. 12 - A certain store contains three balanced...Ch. 12 - The two-wattmeter method gives P1=1200W and...Ch. 12 - In Fig. 12.73, two wattmeters are properly...Ch. 12 - If wattmeters W1 and W2 are properly connected...Ch. 12 - For the circuit displayed in Fig. 12.74, find the...Ch. 12 - Predict the wattmeter readings for the circuit in...Ch. 12 - Prob. 75PCh. 12 - Show that the I2R losses will be higher for a...Ch. 12 - A three-phase generator supplied 10 kVA at a power...Ch. 12 - Prob. 78CPCh. 12 - A balanced three-phase generator has an abc phase...Ch. 12 - A balanced three-phase source furnishes power to...Ch. 12 - A professional center is supplied by a balanced...Ch. 12 - A balanced three-phase system has a distribution...Ch. 12 - A commercially available three-phase inductive...Ch. 12 - Figure 12.76 displays a three-phase...Ch. 12 - Design a three-phase heater with suitable...Ch. 12 - For the single-phase three-wire system in Fig....Ch. 12 - Consider the single-phase three-wire system shown...
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- Three loads are connected in parallel across a single-phase source voltage of 240V(RMS). Load 1 absorbs 15 kW and 6.667 kvar; Load 2 absorbs 3 kVA at O.96PF leading; Load 3 absorbs 15 kW at unity power factor. Calculate the equivalent impedance, Z, for the three parallel loads, for two cases: (i) Series combination of R and X, and (ii) parallel combination of R and X.arrow_forwardConsider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) Falsearrow_forwardA balanced 3-phase load of 30 MW is supplied at 144.3 kV and 0.85 pf lagging by means of transmission line. The sending end voltage is 141.1 kV. The value of constant A is 0.9. Find the %regulation of the transmission linearrow_forward
- 7) In three phase star connected system, the phase voltage is equal to line voltage. Select one: True Falsearrow_forward3-phase ,50Hz overhead transmission line has the following constanats: resistance/phase=9.6ohms inductance/phase=0.097ohms capictance/phase=0.765uf if the line is supplying a balanced load of 24,000KVA 0.8 p.f lagging at 66kv calculate : sending end current line value of sending end current sending end power factor percentage regulation transmission efficiencyarrow_forwardIn a 3phase,3wire system with star connected load, the impedance of each phase is (3+J4)Ω ,if the line voltage is 415V,calculate the line current.arrow_forward
- A 415 V, 50 Hz, 3-phase supply is connected to a star-connected balanced load.Each phase of the load consists of a resistance of 25 and inductance 100mH,connected in series. Calculate (a) phase voltage, (b) the line current drawn from thesupply, and (c) the power dissipated.arrow_forwardA series circuit composed of a resistance of 24 ohms, an inductance of 0.09 henry and a capacitance of 8 microfarad, is connected to a 120-volt 50-Hz supply. Calculate (a) the line current, (b) impedance of the circuit, (c) voltage drop, (d) total reactive power, (e) power factor.arrow_forwardA delta connected balanced 3-phase supply has a line to line voltage of 181 V and supply a line current of 7.6 A to a three phase load. What is the total reactive power supplied by the source if the load power factor is 0.8 lagging (up to two decimal places).arrow_forward
- In a balanced Delta-connected circuit, the phase currents are equal to the line currents. True Falsearrow_forwardA 530 kV, three phase transmission line with a 350 km length. The series impedance Z =(0.11+j0.72) Ω/ph/km and shunt admittance y = (j73 x e(-7)) S/ph/km. Evaluate the equivalent π-model and T-model parameters.arrow_forwardA factory that is fed by a three-phase generator connected in Δ with Vac equal to 240 V with an angle of 30 degrees and negative sequence, has two balanced inductive loads both connected in Y with R = 2.4 Ω and XL = 3 Ω each. Calculate all the line currents leaving the generator to the two loads and show this process.arrow_forward
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