Note: Answer Four Questions only Q1: A three-phase balanced source voltages, operating with a 380 -V line voltage as shown in Fig. 1. Calculate: (1) the phase voltage and power factor (2) the currents 11, 12, 13, and In (3) the total power absorbed by the load. I₁ 1₁ I₁ b B -j15 Ω 292 Figure 1 292 -j1Q2 -j15 Q2 492 ww C

Note: Answer Four Questions only Q1: A three-phase balanced source voltages, operating with a 380 -V line voltage as shown in Fig. 1. Calculate: (1) the phase voltage and power factor (2) the currents 11, 12, 13, and In (3) the total power absorbed by the load. I₁ 1₁ I₁ b B -j15 Ω 292 Figure 1 292 -j1Q2 -j15 Q2 492 ww C

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter23: Resistive-inductive-capacitive Series Circuits

Section: Chapter Questions

Problem 7PP: Is the power factor in Question 6 a leading or lagging power factor? Explain your answer.

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Is the power factor in Question 6 a leading or lagging power factor? Explain your answer.
c) A heater with resistance 10 N is driven by an AC voltage source (120 V). For the circuit shown below, determine the following: 0.50 j5n Vs 120 V/50 Hz j1n Figure Ql i. The total circuit impedance, Zr, in polar form. 11. The supply current, I.. iiI. The phasor diagram indicating the supply voltage, V, and the supply current, 17 iv. Apparent Power, Real Power, Reactive Power and Power Factor. V. The heater output power. 100
ChatGPT 3.5 You A balanced load is connected in star across a 3 phase 415V 50Hz supply. The load consists of a coil of resistance 25 ohms and inductance 0.5 henry in parallel with a pure resistance of 28 ohms and a pure capacitor of 60 microfarads capacitance ib each branch Calculate I. The line currents Ii. The overall power factor. iii. The power delivered from the supply. iv. The power dissipated in the resistors and coils. v. The current in the neutral supported by a reason why its value is that deduced ?
Problem 4 An electric saw, a wood shaper, and a motor load of a workshop establish a 18 kVA power demand at 0.5 power factor lagging on a 208 V, 60 Hz supply. a) Establish the power triangle for the load. b) Determine the power-factor capacitor that must be place in parallel with the load to raise the power factor to 0.9 lagging. c) Determine the change in supply current from the uncompensated to the compensated system. d) Determine the power-factor capacitor that must be placed in parallel with the load to raise the power factor to unity.
120 kV Fig. 1 ۸ جمعت حمت Z= 6 + j8 92 110 kV Balanced 3-phase load
IL 220230° Load P = 2 kW pf = 0.9 lag Assuming that the source is operating at 60 Hz, determine the following: a.) The value of the current I, in phasor form the magnitude, degrees for the angle) b.) What is the reactive power Q of the load in (volts for KVAR? c.) Is the load consuming or supplying Q? d.) What is the apparent power S of the load in KVA? e.) What is the load resistance? Express your answer in Ohms. f.) What is the load inductance? Express your answer in millihenries.
A machine shop is fed by a 250 kVA 480 V three-phase electrical service. On one of thebranches leading away from the service, the shop runs several manufacturing machines,giving the branch a load profile of 175 kW with a 0.85 lagging PF.Determine the minimum allowed gauge of the branch conductors. Branch conductors arealuminum, THW, contained within a raceway with an ambient temperature of 40 ºC
Example: A balanced positive-sequence wye-connected 60 Hz three-phase source has line-to- line voltages of V,=1000 V. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.2 H inductance in series with a 100 0 resistance. Find the line-to-neutral voltages, the line currents, the power, and the reactive power delivered to the load. Assume that the phase of Van is zero.
1) The load shown in the Figure consists of a resistance R in parallel with a capacitor of reactance X. The load is fed from a single-phase supply through a line of impedance 8.4 + jl1.2 Q .The rms voltage at the load terminal is 120020 V rms, and the load is taking 30 kVA at 0.7 power factor leading. (a) Find the values of R and X. (b) Determine the supply voltage V. 8.4 + j11.2 N ww m V 1200/0° VŠR :-jX
The voltage between two phases in a balanced three phase-system (4 conductors) is U = 660V. The voltage between the phase and the neutral is: a) V = 1143 V b) V = 660 V c) V = 381 V A resistance R-30 2 is connected in series with an inductance (L) of reactance X₁.-40 52 and a capacitor (C) reactance Xc-40 Q.The equivalent impedance (Z) is equal to: a) 70 2 b) 30 (2 c) 50 2 The current absorbed by a resistive load of resistance 7.6 0, connected across the terminals of a battery of electromotive force E = 14 V and internal resistance r=0.4 0, is: a) 1 = 1.75 A b) I= 1.84 A c) 1 = 35 A
(b) An inductive load consisting of resistor, R and inductor, L in series feeding from a 240430° Vrms, 50 Hz supply consumes 6 kW at lagging power factor of 0.88. (i) Determine the current through the load. (ii) Find R and L. (iii) Draw the phasor diagram of supply voltage and current.
Question oneA balanced star connected load comprises of 20 ohm resistance and 0.07 Henry inductance in each branch. If the load supplied with 415V at 50Hz, calculatea) the line currentb) the power factorc) the total power supplied to the load PLEASE FOLLOW THIS APPROACH TO SOLVE THE QUESTION. THANK YOUStep OneDeduce the inductive reactance.STEP TwoWrite down a rectangular expression for the impedance per branch.STEP ThreeConvert the rectangular expression into polar expression.STEP FourBecause impedance will be involved in the analysis deduce the phase voltage.STEP FiveSolve for the phase current and hence the line current.STEPVSixUse the phase angle of the current to deduce the power factor. STEP SevenFind the apparent power.