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.

Answered: Image /qna-images/answer/836302a6-c824-4f5b-94b8-20a26429a263.jpg

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)

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ISBN:9780133923605

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Publisher:Robert L. Boylestad

Chapter1: Introduction

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Concept explainers

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.

Question

2.21
The three-phase source line-to-neutral voltages are given by
E = 10/0°, Em = 10/+240°, and En = 10/-240 volts.
Is the source balanced?
(a) Yes
(b) No
In 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) True
2.22
(b) False
2.23 In a balanced system, the phasor sum of line-to-line voltages and the phasor sum of
line-to-neutral voltages are always equal to zero.
(a) False
(b) True
2.24 Consider a three-phase Yconnected source feeding a balanced-Y load. The phasor
sum of the line currents as well as the neutral current are always zero.
(b) False
(a) True
2.25
For 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) True
A balanced A-load can be converted to an equivalent balanced-Y load by dividing the
A-load impedance by
(a) V3
When working with balanced three-phase circuits, per-phase analysis is commonly
done after converting A loads to Y loads, thereby solving only one phase of the
circuit.
(b) False
2.26
) з
(e) 1/3
2.27
(a) True
(b) False
2.28 The total instantaneous power delivered by a three-phase generator under balanced
operating conditions is
(a) a function of time
(b) a constant
2.29 The total instantaneous power absorbed by a three-phase motor (under balanced
steady-state conditions) as well as a balanced three-phase impedance load is
(a) a constant
(b) a function of time
2.30
Under balanced operating conditions, consider the 3-phase complex power delivered
by the 3-phase source to the 3-phase load. Match the following expressions, those on
the 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 +Qy
Note that VLL is the rms line-to-line voltage, IL is the ms line current, and o is the
power-factor angle.

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