Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 2, Problem 2.22P
Prove that the three-phase system of voltages on the secondary of the
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HW_#1
HW_01.pdf EE 213-01
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P Pearson MyLab and Mastering
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Watch out for units (i.e, kQ, mA, etc), show all units on answers and
clearly mark all answers
1)(5 pts) Specify if the following elements are absorbing or delivering power, and determine the
amount of power being absorbed or delivered.
10 V +
a)
5A
+
5 V
-
b)
2A
+ 10 V
-2A
2)(5 pts) Two circuits, shown by boxes A and B are connected as shown below. Use the
current reference direction provided and the voltage reference polarity shown to determine
the power for the interconnection. Also state the direction of power flow for the
connection: form A to B or B to A.
A
I
+
I
a) I = -6 A
V = -20 Volts
b) 1 = 8 A
V = 30 Volts
c) = 4 A
V = -80 Volts
d) I = -5 A
V = 40 Volts
B
3) (5 pts) Use Ohm's Law, KCL and KVL to determine values for V1, V2, V₁, I₁, and I2.
200 Ohms
A,
+
12
+
V1 75 Ohms
3 Amps
+
V2
300 Ohms
25 Ohms
4) (5 pts) For the circuit in Problem 2, determine the power (expressed as a…
Find the power delivered across the 10 ohm resistor
For the Circuit Below Find:
A) io in terms of Rb and the numerical resistor values provided in the schematic. Reduce your
solution to a minimal Equations
B)the power delivered across Rb in terms of Rb and the numerical resistor values provided in the
schematic. Reduce your solution to a minimal equation.
C) the power delivered across Rc if Rb is 5 Q
Ra $50
15Ω
M
120
90V
+1
Rb
150 150
m
Rc
Chapter 2 Solutions
Electric machinery fundamentals
Ch. 2 - Is the turns ratio of a transformer the same as...Ch. 2 - Why does the magnetization current impose an upper...Ch. 2 - What components compose the excitation current of...Ch. 2 - What is the leakage flux in a transformer? Why is...Ch. 2 - List and describe the types of losses that occur...Ch. 2 - Why does the power factor of a load affect the...Ch. 2 - Why does the short-circuit test essentially show...Ch. 2 - Why does the open-circuit test essentially show...Ch. 2 - How does the per-unit system of measurement...Ch. 2 - Why can autotransformers handle more power than...
Ch. 2 - What are transformer taps? Why are they used?Ch. 2 - What are the problems associated with the Y—Y...Ch. 2 - What is a TCUL transformer?Ch. 2 - How can three-phase transformation be accomplished...Ch. 2 - Prob. 2.15QCh. 2 - Can a 60-Hz transformer be operated on a 50-Hz...Ch. 2 - What happens to a transformer when it is first...Ch. 2 - What is a potential transform? How is it used?Ch. 2 - What is a current transformer? How is it used?Ch. 2 - A distribution transformer is rated at 18 kVA,...Ch. 2 - Why does one hear a hum when standing near a large...Ch. 2 - A 100-kVA, 8000/277-V distribution transformer has...Ch. 2 - A single-phase power system is shown in Figure...Ch. 2 - Consider a simple power system consisting of an...Ch. 2 - The secondary winding of a real transformer has a...Ch. 2 - When travelers from the USA and Canada visit...Ch. 2 - A 1000-VA, 230/115-V transformer has been tested...Ch. 2 - A 30-kVA, 8000/230-V distribution transformer has...Ch. 2 - A 150-MVA, 15/200-kV, single-phase power...Ch. 2 - A 5000-kVA, 230/13.8-kV, single-phase power...Ch. 2 - A three-phase transformer bank is to handle 500...Ch. 2 - A 100-MVA, 230/115-kV, Y three-phase power...Ch. 2 - Three 20-kVA, 24,000/277-V distribution...Ch. 2 - A 14,000/480-V, three-phase, Y-connected...Ch. 2 - A 13.8-kV, single-phase generator supplies power...Ch. 2 - An autotransformer is used to connect a 12.6-kV...Ch. 2 - Prove the following statement: If a transformer...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - Two phases of a 14.4-kV, three-phase distribution...Ch. 2 - A 50-kVA, 20,000/480-V, 60-Hz, single-phase...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - A single-phase, 10-kVA, 480/120-V transformer is...Ch. 2 - Figure P2-4 shows a one-line diagram of a power...
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