18081123

Study Guide Module 2 ECET 207
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Figure 16.3
1) See Figure 16.3. Which one equation describes the total impedance ZT for this circuit?
A) ZT = Z1 + Z2 - Z3
B) ZT = (Z1 + Z2 )  Z3
C) ZT = Z1 + Z2 + Z3
D) ZT = (Z1  Z2 )  Z3
1)
Figure 16.4
2) See Figure 16.4. Which one of these statements is true?
A) I3 = I 2 + I 5
B) I4 = I 6
C) I3 = I 4 + I 6
2)
D) IS = I 3
3) See Figure 16.4. If E = 10 V ≥30° and IS = 5 A ≥10°, what is the total impedance ZT?
A) 32.1 Ω + j38.3 Ω
B) 1.88 Ω + j0.68 Ω
C) 38.3 Ω + j32.1 Ω
D) 0.47 Ω - j0.17 Ω
1
3)
Figure 16.5
4) See Figure 16.5. What is the total admittance YT of this circuit?
A) 63.73 S ∠11.3°
B) 0.016 S ∠-11.3°
C) 0.02 S ∠90°
5) See Figure 16.5. What is the value of current I1 ?
A) 1 A ∠120°
B) 0.72 A ∠26.3°
4)
D) 0.028 S ∠-56.3°
5)
C) 1.39 A ∠-26.3°
D) 1 A ∠-120°
Figure 16.2
6) See Figure 16.2. If L = 10 mH, what is the applied frequency? What is the value of the
capacitor?
6)
Figure 17.1
7) See Figure 17.1. The voltage source (a) consists of E = 50 V ∠20° and Z = 100 Ω ∠30°. If this voltage
source is converted to a current source (b), what is the value of the current I?
A) 5000 A ∠50°
B) 0.5 A ∠-10°
C) 50 A ∠20°
D) 2.0 A ∠10°
2
7)
Figure 17.3
8) See Figure 17.3. Which one equation describes current I2 ?
A) I2 = (V1 + V2 )/Z2
B) I2 = -IA
C) I2 = (V1 - V2 )/Z2
D) I2 = I 4 + I A
8)
Figure 17.8
9) Referring to the circuit shown in Figure 17.8, determine the current through the 2 Ω inductor, by
using Mesh Analysis.
A) 3.61 A ∠124°
B) 20.0 A ∠-143°
C) 4.47 A ∠153°
9)
Figure 18.1
10) See Figure 18.1. Using the superposition theorem, what is the portion of the current through the
capacitor caused by the 10V ∠0° voltage source?
A) 0.822 A ∠9.46°
B) 5.0 A ∠90°
C) 0.616 A ∠130°
D) 0.741 A ∠55.6°
3
10)
Figure 18.2
11) See Figure 18.2. What is the Thevenin voltage external to ZL?
A) 3.33 V ∠0°
B) 3.33 V ∠-26.6°
C) 10 V ∠0°
11)
D) 4.47 V ∠-63.4°
Figure 18.3
12) See Figure 18.3. What is the Norton equivalent impedance ZN external to ZL?
A) 10.0 Ω ∠0°
B) 11.18 Ω ∠26.6°
C) 5.0 Ω ∠90°
D) 0.47 Ω ∠-26.6°
12)
13) In a series circuit, if E=50∠0 and I=6∠-90, then the load is purely ________________.
A) capacitive
B) inductive
C) resistive
13)
14) In order to remove a current source from a circuit, we must replace it with an __________
circuit.
4
14)
Figure 17.4
15) See Figure 17.4. Assume that the bridge is balanced. If Z1 = 20 Ω ≥0°, Z2 = 15 Ω ≥30°, Z3 = 4 Ω
≥-10°, what must Z4 be?
A) 3 Ω ≥20°
B) 8 Ω ≥20°
C) 25 Ω ≥-10°
D) 2 Ω ≥40°
5
15)
Answer Key
Testname: MODULE2_SG
1)
2)
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B
C
B
B
C
159 Hz, 100 µF
B
C
A
A
D
B
B
open
A
6