2.21The three-phase source line-to-neutral voltages are given byE = 10/0°, Em = 10/+240°, and En = 10/-240 volts.Is the source balanced?(a) Yes(b) NoIn a balanced 3-phase wye-connected system with positive-sequence source, the line-to-line voltages are v3 times the line-to-neutral voltages and lend by 30.(a) True2.22(b) False2.23 In a balanced system, the phasor sum of line-to-line voltages and the phasor sum ofline-to-neutral voltages are always equal to zero.(a) False(b) True2.24 Consider a three-phase Yconnected source feeding a balanced-Y load. The phasorsum of the line currents as well as the neutral current are always zero.(b) False(a) True2.25For a balanced-A load supplied by a balanced positive-sequence source, the line cur-rents into the load are v3 times the A-load currents and lag by 30°.(a) TrueA balanced A-load can be converted to an equivalent balanced-Y load by dividing theA-load impedance by(a) V3When working with balanced three-phase circuits, per-phase analysis is commonlydone after converting A loads to Y loads, thereby solving only one phase of thecircuit.(b) False2.26) з(e) 1/32.27(a) True(b) False2.28 The total instantaneous power delivered by a three-phase generator under balancedoperating conditions is(a) a function of time(b) a constant2.29 The total instantaneous power absorbed by a three-phase motor (under balancedsteady-state conditions) as well as a balanced three-phase impedance load is(a) a constant(b) a function of time2.30Under balanced operating conditions, consider the 3-phase complex power deliveredby the 3-phase source to the 3-phase load. Match the following expressions, those onthe left to those on the right.0) Real power, Py(ii) Reactive power, Qu(ii) Total apparent power Sy(iv) Complex power, Sy(a) (V3 VLL. IL)VA(b) (V3 Vu sng) var(e) (V3 VLL. IL cos ø) W(d) Py +QyNote that VLL is the rms line-to-line voltage, IL is the ms line current, and o is thepower-factor angle.

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Answered: 2.21 The three-phase source…

2.21 The three-phase source line-to-neutral voltages are given by E= 10/0, E = 10/+240, and E = 10/-240 volts. Is the source balanced? (a) Yes (b) No

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Part b)
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