Electric Circuits. (11th Edition)
11th Edition
ISBN: 9780134746968
Author: James W. Nilsson, Susan Riedel
Publisher: PEARSON
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Question
Chapter 3, Problem 13P
(a)
To determine
Calculate the value of no-load voltage
(b)
To determine
Calculate the values of the power dissipated in the resistances
(c)
To determine
Find the smallest ohmic values of the resistances
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Students have asked these similar questions
Q3. a) Design a DC/DC buck converter as shown in Figure Q3. has an input
voltage of 12V and an output of 5V at 20A. Assume a switching frequency
of 10kHz. Constrain the inductor ripple current to 10% of the input current
and limit the output voltage ripple to 50mVp-p.
i)
Calculate the boundary duty cycle. Show whether the circuit is in
continuous conduction mode or not and why?
ii)
How should the duty cycle be controlled so that the output voltage is
5V for loads between 0 and 2A?
Vin
DZ
L
Ω
R
Figure Q3. DC/DC buck converter.
Q4. Figure Q4. shows a power system with one generator, two transformers, a line
and a load.
Zload=0.3+j0.102
G
Vgen-415/0°V
R = 0.02 2
tot
ZLine=1+j0.10
600 kVA
0.415/11 kV Y-Y
XT1=6%
tot
500 kVA
11/0.415 kV Y-Y
XT2=5%
Figure Q4. A Simple Power System
Q4. Figure Q4. shows a power system with one generator, two transformers, a line
and a load.
G
Vgen-415/0°V
от
R = 0.02
600 kVA
0.415/11 kV Y-Y
XT1=6%
ZLine=1+j0.1
tot
Zload=0.3+j0.102
500 kVA
11/0.415 kV Y-Y
XT2=5%
Figure Q4. A Simple Power System
a)
i.
ii.
The one-line diagram shown in Figure Q4. is a proposal for a new power
system. Assuming a base apparent power of 600 kVA and a base voltage
of 11 kV in the line section:
Calculate the Current magnitudes in the generator, line and load
sections
Calculate the overall system power factor
iii.
Obtain the system losses at rated operating conditions, and the potential
for series power factor correction, stating the value of the capacitor
necessary to bring the system power factor to unity.
Chapter 3 Solutions
Electric Circuits. (11th Edition)
Ch. 3.2 - For the circuit shown, find (a) the voltage υ, (b)...Ch. 3.3 - Find the no-load value of υo in the circuit...Ch. 3.3 -
Find the value of R that will cause 4 A of...Ch. 3.4 - Use voltage division to determine the voltage υo...Ch. 3.5 - a. Find the current in the circuit shown.
b. If...Ch. 3.5 - Find the voltage υ across the 75 kΩ resistor in...Ch. 3.6 - The bridge circuit shown is balanced when R1 = 100...Ch. 3.7 - Use a Y-to-Δ transformation to find the voltage υ...Ch. 3 - For each of the circuits shown in Fig. P...Ch. 3 - Prob. 2P
Ch. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - In the circuits in Fig. P 3.7(a)–(d), find the...Ch. 3 - Prob. 8PCh. 3 - Find the power dissipated in each resistor in the...Ch. 3 - In the voltage-divider circuit shown in Fig. P...Ch. 3 - Calculate the no-load voltage υo for the...Ch. 3 - The no-load voltage in the voltage-divider circuit...Ch. 3 - Assume the voltage divider in Fig. P3.14 has been...Ch. 3 - The voltage divider in Fig. P3.16 (a) is loaded...Ch. 3 - There is often a need to produce more than one...Ch. 3 - For the current-divider circuit in Fig. P3.19...Ch. 3 - Find the power dissipated in the 30 resistor in...Ch. 3 - Specify the resistors in the current-divider...Ch. 3 - Show that the current in the kth branch of the...Ch. 3 - Look at the circuit in Fig. P3.1 (a).
Use voltage...Ch. 3 - Look at the circuit in Fig. P3.1 (d).
Use current...Ch. 3 - Attach a 6 V voltage source between the terminals...Ch. 3 - Look at the circuit in Fig. P3.7(a).
Use current...Ch. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - For the circuit in Fig. P3.29, calculate i1 and i2...Ch. 3 - Find υ1 and υ2 in the circuit in Fig. P3.30 using...Ch. 3 - Find υo in the circuit in Fig. P3.31 using voltage...Ch. 3 - Find the voltage υx in the circuit in Fig. P3.32...Ch. 3 - A shunt resistor and a 50 mV. 1 mA d’Arsonval...Ch. 3 - Show for the ammeter circuit in Fig. P3.34 that...Ch. 3 - A d'Arsonval ammeter is shown in Fig....Ch. 3 - A d'Arsonval movement is rated at 2 mA and 100 mV....Ch. 3 - A d’Arsonval voltmeter is shown in Fig. P3.37....Ch. 3 - Suppose the d’Arsonval voltmeter described in...Ch. 3 - The ammeter in the circuit in Fig. P3. 39 has a...Ch. 3 - The ammeter described in Problem 3.39 is used to...Ch. 3 - The elements in the circuit in Fig2.24. have the...Ch. 3 - The voltmeter shown in Fig. P3.42 (a) has a...Ch. 3 - Assume in designing the multirange voltmeter shown...Ch. 3 - The voltage-divider circuit shown in Fig. P3.44 is...Ch. 3 - Prob. 45PCh. 3 - You have been told that the dc voltage of a power...Ch. 3 - Prob. 47PCh. 3 - Design a d'Arsonval voltmeter that will have the...Ch. 3 - Prob. 49PCh. 3 - Prob. 50PCh. 3 - The bridge circuit shown in Fig. 3.28 is energized...Ch. 3 - Find the detector current id in the unbalanced...Ch. 3 - Find the power dissipated in the 18Ω resistor in...Ch. 3 - Find the current and power supplied by the 40 V...Ch. 3 - Find the current and power supplied by the 40 V...Ch. 3 - Find the current and power supplied by the 40 V...Ch. 3 - Use a Δ-to-Y transformation to find the voltages...Ch. 3 - Prob. 59PCh. 3 - Find io and the power dissipated in the 140Ω...Ch. 3 - Find the equivalent resistance Rab in the circuit...Ch. 3 - Find the resistance seen by the ideal voltage...Ch. 3 - Show that the expressions for Δ conductances as...Ch. 3 - Prob. 65PCh. 3 - Prob. 66PCh. 3 - Prob. 67PCh. 3 - The design equations for the bridged-tee...Ch. 3 - Prob. 69PCh. 3 - Prob. 70PCh. 3 - Prob. 71PCh. 3 - Prob. 72PCh. 3 - Prob. 73PCh. 3 - Prob. 74PCh. 3 - Prob. 75P
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- b) A 230 V shunt DC motor is used for a check-out conveyer in a shop. The motor has an armature resistance of 0.5 Q and a field resistance of 115 Q. It draws a no-load current of 6 A and has a no-load speed of 1000 rev/min. (i) Draw the equivalent electrical circuit of the motor (ii) When the supply current at a given load is 22 A, determine the motor speed and motor efficiency. c) Compare series and shunt DC motors in terms of their construction, torque- speed characteristics, operational considerations to avoid possible risks and applications.arrow_forwardQ1. a) A lift is driven by a 230 V series DC motor. The motor resistance is 0.5 Q and the magnetic circuit is assumed unsaturated. The motor runs at 250 rev/min with a load current of 20 A. (i) If more passengers come into the lift and the load torque is increased by 21%, what would be the motor speed if the supply voltage is unchanged? (ii) In order to maintain the motor at 250 rev/min, what is the supply voltage required?arrow_forwardb) Consider a buck converter driven at a switching frequency of 50 kHz, supply voltage is 200V DC, and duty cycle is 0.25; i) Sketch labelled waveforms for: 1- Inductor current Transistor current 2- 3- Diode current 4- Diode voltage 5- Transistor voltage. ii) What is the value of the output voltage? iii) What are the peak voltages appearing across the transistor and diode?arrow_forward
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