Questions and Answers of Electronics Fundamentals A Systems Approach

Find the total impedance of the circuit in Figure 13–71. 5 V f= 12 kHz R 100 Ω L 15 mH C 0.022 μF FIGURE 13-71
Draw the waveforms for Vs, VR, and VL in Figure 12–48. Show the proper phase relationships. V 1 V R www 47 60 Hz FIGURE 12-48 lll L 100 mH
What is the impedance for the circuit in Figure 12–50? Vs 1.5 VI f=2 kHz (2) FIGURE 12-50 lll L 800 με Hl₁ R 12 Ω
Find the total current and each branch current in Figure 12–51. V₂ 10 V 2 FIGURE 12–51 Μ R 2.2 ΚΩ Il ell XL 3.5 ΚΩ
What is the admittance of the circuit in Figure 12–51 if the frequency is doubled? V. S 10 V FIGURE 12-51 Μ R ´ 2.2 ΚΩ lll X₁ 3.5 ΚΩ
What is the admittance of the circuit in Figure 12–51? V₂ 10 V FIGURE 12-51 www R 2.2 ΚΩ ell XL 3.5 ΚΩ
Find the current in each branch and the total current in Figure 12–54. FIGURE 12-54 R₁ 220 Ω V₂ 25 V f = 100 kHz L 1.0 mH R₂ 1500 Ω
What is the power factor in Figure 12–51? V₂ 10 V FIGURE 12–51 Μ R 2.2 ΚΩ XL 3.5 ΚΩ
At what frequency does XL equal R in Figure 12–50? Vs 1.5 V f = 2 kHz 2 FIGURE 12-50 L 800 ΜΗ www R 12 Q2
Is the circuit in Figure 12–54 predominantly resistive or predominantly inductive? FIGURE 12-54 R₁ 220 Ω Vs 25 V f = 100 kHz L 1.0 mH R₂ 1500 Ω
Determine the voltage across each element in Figure 12–54. FIGURE 12-54 R₁ www 220 Ω V₂ 25 V f = 100 kHz L 1.0 mH R₂ 1500 Ω
Draw the voltage phasor diagram for the circuit in Figure 12–55 for a frequency of 500 Hz. 5 V O R 150 ell L 100 mH FIGURE 12-55
Plot the response curve for the circuit in Figure 12–49. Show the output voltage versus frequency in 200 Hz increments from 0 to 1200 Hz. V 5 V L m 100 mH FIGURE 12-49 R 150
Determine if the voltage reading on the DMM in Figure 12–57 is correct or not. Explain your answer. V₂ 10 V₁ rms FIGURE 12-57 R www 10 ΚΩ ell XL = 10
Determine the voltage across the inductors in Figure 12–58. R₁ www 56 Ω V₁ 25 V f = 400 Hz FIGURE 12-58 R3 www 33 02 R₂ 22 (2 lll L₁ 50 mH ell L2 50 mH
Find the total current in Figure 12–58. R₁ www 56 Ω V₂ 25 V f = 400 Hz FIGURE 12-58 www R3 www 33 02 R₂ 22 (2 lll 4₁ 50 mH ell 4₂2 50 mH
Find the impedance in Figure 13–65. R Μ 4.7 ΚΩ XL 8.0 ΚΩ Χε 1 3.5 ΚΩ FIGURE 13–65
For the circuit in Figure 13–65, find Itot, VR, VL, and VC. 4V R Μ 4.7 ΚΩ XL 8.0 ΚΩ Xc 3.5 ΚΩ FIGURE 13-65
If the frequency of the source voltage in Figure 13–65 is doubled from the value that produces the indicated reactances, how does the impedance change? 4V R Μ 4.7 ΚΩ XL 8.0 ΚΩ Χε 3.5
Find XL, XC, Z, and I at the resonant frequency in Figure 13–67. FIGURE 13-67 V₂ 12 V R www 220 Ω L m 1.0 mH C 47 pF
Analyze the circuit in Figure 13–66 for the following (f = 25 kHz):(a) Itot (b) Ptrue (c) Pr (d) Pa 12 V R₁ www 220 02 R₂ www 390 Ω L₁ m 42 m 0.5 mH 1.0 mH C₁ 0.01
Draw the voltage phasor diagram for the circuit in Figure 13–65. 4V R 4.7 XL 800 8.0 H 3.5 FIGURE 13-65
For the circuit in Figure 13–65, is the resonant frequency higher or lower than the value indicated by the reactances? 4V Ο R 4.7 ΚΩ XL 8000 8.0 ΚΩ Χ 3.5 ΚΩ FIGURE 13–65
For the circuit in Figure 13–67, determine the voltage across R at resonance. FIGURE 13-67 V₂ 12 V R www 220 02 L m 1.0 mH 47 pF
Assuming that the coils in Figure 13–69 have a winding resistance of 10 Ω, find the bandwidth for each filter. (2) L g 12 mH 0.01 με FIGURE 13–69 R 75 Ω (b) L 800 2.0 mH 0.022 με R 22 Ω
What is the value of the current at the half-power points in Figure 13–68? FIGURE 13-68 Vs 3.0 V R www 39 Ω 1.5 nF L m 82 μΗ
For the RLC circuit in Figure 13–68, determine the resonant frequency and the cutoff frequencies. FIGURE 13–68 V₂ 3.0 V R 39 Ω 1.5 nF L 800 82 μΗ
Is the circuit in Figure 13–71 capacitive or inductive? Explain. 5 V f = 12 kHz www R 100 Ω L 15 mH C 0.022 μF FIGURE 13-71
For the circuit in Figure 13–71, find all the currents and voltages. Vs 5 V f = 12 kHz R 100 Ω lll L 15 mH C 0.022 μF FIGURE 13-71
A certain series resonant circuit has a maximum current of 50 mA and a VL of 100 V. The source voltage is 10 V. What is Z? What are XL and XC?
Determine the resonant frequency for each filter in Figure 13–69. Are these filters band-pass or band-stop types? (a) L m 12 mH C 0.01 μF FIGURE 13-69 R 75 Ω (b) L m 2.0 mH C 0.022 μF R 22 Ω
Find the total impedance for the circuit in Figure 13–72. Vs 5 V 10 kHz + m L 10 mH R 80 Ω C 15 nF FIGURE 13-72
How much current is drawn from the source in Figure 13–73 at resonance? What are the inductive current and the capacitive current at the resonant frequency? V₁ = 6.3 V R 20 Ω L 50 mH C 47
What is the impedance of an ideal parallel resonant circuit (no resistance in either branch)?
For each following case, express the voltage ratio in decibels: (a) Vin (c) Vin = 1 V, Vout = 1V 10 V, Vout = 7.07 V (b) Vin 5 V, Vout = 3 V (d) Vin=25 V, Vout=5V
If the lower cutoff frequency is 2400 Hz and the upper cutoff frequency is 2800 Hz, what is the bandwidth?
In a certain resonant circuit, the power to the load at resonance is 2.75 W. What is the power at the lower and upper cutoff frequencies?
Find the current through each component in Figure 13–74. Find the voltage across each component. FIGURE 13–74 R₁ 3.3 ΚΩ V = 10 V Χρ 1.0 ΚΩ XLI | 5.0 ΚΩ Χει 10 ΚΩ R₂ 10 ΚΩ
A parallel resonant band-stop filter is needed to reject 60 Hz power line noise. What size should the inductor be if the capacitor is 200 μF?
Draw the circuit described in Problem 28 if the output is taken across a 220 Ω resistor.Data in Problem 28A parallel resonant band-stop filter is needed to reject 60 Hz power line noise. What size
Determine whether there is a value of C that will make Vab = 0 V in Figure 13–75. If not, explain. FIGURE 13-75 V₂ 12 V f = 3 kHz R₁ 180 Ω L₁ 12 mH C L2 8.0 mH
Design a band-pass filter using a parallel resonant circuit to meet the following specifications: BW 500 Hz, Q = 40, Ic(max) = = 20 mA, VC(max) = 2.5 V.
If the value of C is 0.22 μF, how much current is through each branch in Figure 13–75? What is the total current? FIGURE 13-75 V₂ 12 V f = 3 kHz 11 ell R₁ 180 Ω L₁ 12 mH lll C L2 8.0 mH
Design a circuit in which the following series resonant frequencies are switch-selectable: 500 kHz, 1000 kHz, 1500 kHz, 2000 kHz.
Determine the phase of the secondary voltage with respect to the primary voltage for each transformer in Figure 14–43. (a) lell eee FIGURE 14-43 (b) ell (C)
What is the turns ratio of a transformer having 120 turns in its primary winding and 360 turns in its secondary winding?
(a) What is the turns ratio of a transformer having 250 turns in its primary winding and 1000 turns in its secondary winding? (b) What is the turns ratio when the primary winding has 400 turns
In a silicon crystal, how many covalent bonds does a single atom form?
What happens when heat is added to silicon?
Name the two energy levels at which current is produced in silicon.
Determine the impedance and the phase angle in Figure 10–70. Vs 18 V f=2 kHz FIGURE 10-70 C 0.22 μF R www 750 Ω
Determine the series element or elements that are in the block of Figure 10–83 to meet the following overall circuit requirements: (a) Ptrue = 400 W (b) Leading power factor (Itot leads
Determine the value of C2 in Figure 10–84 when VA = VB. V 1 kHz 2.2 ΚΩ R₁ A FIGURE 10-84 www C₁ 0.047μF R₂ www 1.0 ΚΩ C₂ B
Draw the schematic for the circuit in Figure 10–85 and determine if the waveform on the scope is correct. If there is a fault in the circuit, identify it. Ch 1 1V (a) Oscilloscope display
Convert the following to millihenries: (a) 1 H (b) 250 μH (c) 10 μH (d) 0.0005 H.
Convert the following to microhenries: (a) 300 mH (b) 0.08 H (c) 5 mH (d) 0.00045 mH.
A 12 V battery is connected across a coil with a winding resistance of 120 Ω. How much current is there in the coil?
How much energy is stored by a 100 mH inductor with a current of 1 A?
The current through a 100 mH coil is changing at a rate of 200 mA/s. How much voltage is induced across the coil?
Five inductors are connected in series. The lowest value is 5 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values,
Determine the total inductance of each circuit in Figure 11–41. (a) 42 m 50 mH L₁ 100 mH FIGURE 11-41 lll L₂ 50 mH (b) lll LI 100 μΗ L2 ,200 H мее L3 400 ΜΗ
You have a 12 mH inductor, and it is your smallest value. You need an inductance of 8 mH. What value can you use in parallel with the 12 mH to obtain 8 mH?
Determine the total inductance of each circuit in Figure 11–42. (a) L₁ m 100 ΜΗ L2 m 50 ΜΗ FIGURE 11-42 L3 60 ΜΗ ell L4 | 40 ΜΗ (b) ell L₁ 8 mH L2 4 mH L3 2 mH L4 4 mH
In the circuit of Figure 11–43, there is initially no current. Determine the inductor voltage at the following times after the switch is closed: (a) 10 μs (b) 20 μs (c) 30
In Figure 11–44, calculate the current at each of the following times. Assume an ideal inductor and voltage source.(a) 10 μs (b) 20 μs (c) 30 μs. V. 10 V () 10 kHz FIGURE 11-44 R 8.2
Find the total reactance for each circuit in Figure 11–41 when a voltage with a frequency of 500 kHz is applied across the terminals. (a) 42 m 50 mH Li 100 mH FIGURE 11-41 ell L3 50
Find the total reactance for each circuit in Figure 11–42 when a 400 kHz signal is applied. (a) L₁ m 100 μΗ L₂ 000 50 ΜΗ FIGURE 11-42 L3 60 μΗ L4 40 ΜΗ (b) L₁ 8 mH L2 4 mH L3 2
Determine the time constant for the circuit in Figure 11–46. FIGURE 11-46 Vs 15 V Ar R₁ 4.7 ΚΩ R₂ 4.7 ΚΩ Μ L₁ 3.3 mH R₂ 3.3 ΚΩ Μ R4 6.8 ΚΩ
What is the waveshape of the current in the circuit of Problem 1? Data in Problem 1? An 8 kHz sinusoidal voltage is applied to a series RC circuit. What is the frequency of the voltage
Find the impedance of each circuit in Figure 10–61.Data in Figure 10–61. 10 V (2) FIGURE 10-61 Xc 100 Ω R 270 Ω www 5 V Ξ Xc 1.0 ΚΩ R Μ 680 Ω
Determine the impedance and the phase angle in each circuit in Figure 10–62. 50 V (a) R₁ www 100 ΚΩ f= 100 Hz C₁ FIGURE 10-62 C₂ 0.01 μF 0.022 μF R₂ 47 ΚΩ 8 V (b) R www 10 ΚΩ f = 20
For the circuit of Figure 10–63 , determine the impedance for each of the following frequencies:(a) 100 Hz (b) 500 Hz (c) 1.0 kHz (d) 2.5 kHz V₂ 10 V FIGURE 10-63 R Μ 56
Calculate the total current in each circuit of Figure 10–61. 10 V (a) FIGURE 10-61 Xc 100 Ω R 270 Ω Μ 5V (b) e Xc 1.0 ΚΩ R 680 Ω
For the circuit in Figure 10–64, draw the phasor diagram showing all voltages and the total current. Indicate the phase angles. Vs 2 V rms f = 15 kHz FIGURE 10-64 C 0.1 F C 0.22 UF R 100 R 100
For the circuit in Figure 10–65, determine the following:(a) Z (b) I (c) VR (d) VC. Vs 10 V rms f = 20 Hz FIGURE 10-65 R www 56 Ω C 100 μF
To what value must the rheostat be set in Figure 10–66 to make the total current 10 mA? What is the resulting phase angle? 10 V 2 10mA f = 10 kHz FIGURE 10-66 C 0.027 μF R
For the lag circuit in Figure 10–67, determine the phase lag between the input voltage and the output voltage for each of the following frequencies:(a) 1 Hz (b) 100 Hz (c) 1.0
Determine the impedance for the circuit in Figure 10–69. 10 V FIGURE 10-69 R 1.2 ΚΩ Xc 2.2 ΚΩ
Determine the impedance and phase angle in Figure 10–71. V₂ 18 V rms f = 2 kHz FIGURE 10-71 C₁ 0.1 μF R₁ www 470 Ω C₂ 0.22 μF R3 ww 680 Ω R₂ 330 Ω
For the circuit in Figure 10–72, find all the currents and voltages. V₂ 10 V FIGURE 10-72 · Xc 90 Ω Μ R 68 Ω
For the parallel circuit in Figure 10–73, find each branch current and the total current. What is the phase angle between the source voltage and the total current? 8 V f = 50 kHz FIGURE
Find the total current for the circuit in Figure 10–75. V₂ 2V f = 100 kHz FIGURE 10-75 Μ R₁ 10 ΚΩ R₂ 12 ΚΩ H C₁ 100 pF C 47 pF
Is the circuit in Figure 10–76 predominantly resistive or predominantly capacitive? V₂ 12 V f = 15 kHz FIGURE 10-76 C₁ HH 0.1 μF C₂. 0.047μF R₁ 330 Ω C3 0.22 μF R₂ 180 Ω
Find the current through each branch and the total current in Figure 10–76. 12 V f = 15 kHz FIGURE 10-76 C₁ 0.1 μF C₂ 0.047μF +₁₁ R₁ 330 Ω C3 0.22 μF R₂ 180 Ω
For the circuit in Figure 10–77, determine the following:(a) Itot (b) θ (c) VRI (d) VR2 (e) VR3 (f) Vc V₂ 15 V f = 1 kHz C 0.47μF FIGURE 10-77 R₁ www 47
In Figure 10–65, what is the true power and the reactive power? Vs 10 V rms f = 20 Hz FIGURE 10-65 R www 56 Ω +₁₁ C 100 μF
What is the power factor for the circuit of Figure 10–75? Vs 2 V f = 100 kHz FIGURE 10-75 R₁ 10 ΚΩ R₂ 12 ΚΩ C₁ 100 pF C₂ 47 pF
Determine the bandwidth of the circuit in Figure 10–68. Vin 10 V FIGURE 10-68 C 0.1 MF H11 R 1.0 ΚΩ
Each of the capacitors in Figure 10–80 has developed a leakage resistance of 2 kΩ. Determine the output voltages under this condition for each circuit. 1V f = 10 Hz (a) R₁ Μ 10 ΚΩ FIGURE
Determine the value of R1 required to get a phase angle of 30° between the source voltage and the total current in Figure 10–82. V₂ 10 V f = 1 kHz FIGURE 10-82 www R₁ www R₂ 47 ΚΩ C 0.01
A certain load dissipates 1.5 kW of power with an impedance of 12 Ω and a power factor of 0.75. What is its reactive power? What is its apparent power?
What is the voltage across the inductor in Figure 11–44 at each of the following times? (a) 60 μs (b) 70 μs (c) 80 μs 10 V 10 kHz FIGURE 11-44 R www 8.2 ΚΩ ell L 75 mH V₂ 10
What is the voltage across the resistor in Figure 11–44 at a time of 60 μs? V₂ 10 V ( 10 kHz FIGURE 11-44 R www 8.2 ΚΩ L 75 mH Vs 10 V OV 0 50 100 t(us)
Find the impedance of each circuit in Figure 12–45. V₂ 10 V (a) XL 500 Ω FIGURE 12-45 R 1.0 ΚΩ Vs 5V (b) XL 1.0 ΚΩ R 1.5 ΚΩ
Determine the impedance and phase angle for the circuit in Figure 12–46. 8 V R 470 02 f=20 kHz FIGURE 12-46 lll lll L₁ 5.0 mHe L2 8.0 mH
In Figure 12–47, determine the impedance at each of the following frequencies:(a) 100 Hz (b) 500 Hz (c) 1 kHz (d) 2 kHz V₂ R www 12 Ω FIGURE 12-47 L m 20 mH
Assume that the inductance in Figure 12–45 (a) is 796 μH. What is the source frequency? V₂ 10 V (a) XL 500 Ω FIGURE 12-45 +₁₁ R 1.0 ΚΩ
Determine the voltage across the total resistance and across the total inductance in Figure 12–46. V₂ 8 V R 470 02 f=20 kHz FIGURE 12-46 lll lll L1 5.0 mH L2 8.0 mH
Find the current for each circuit of Figure 12–45. V₂ 10 V (a) Ο XL 000 500 Ω FIGURE 12-45 R 1.0 ΚΩ V₂ 5V (b) XL 80 Μ 1.0 ΚΩ R 1.5 ΚΩ
Calculate the total current for the circuit of Figure 12–46. V₂. 8 V R 470 Ω f=20 kHz FIGURE 12-46 lll L₁ 5.0 mHe L2 8.0 mH

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