Study guide - Module 1
Name___________________________________
1) Find the period of a periodic wave that has a frequency of 0.2 Hz.
A) 50 seconds
B) 5 milliseconds
C) 0.5 seconds
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D) 5 seconds
2) Find the frequency of a periodic wave that has a period of one hour.
A) 0.278 mHz
B) 27.8 mHz
C) 278 mHz
D) 2.78 mHz
2)
3) What is the phase relationship between voltage v and current i if
v = 15 sin(γt + 30°) and
i = 20 sin(γt - 10°)?
3)
Figure 13.4
4) See Figure 13.4. Write the general voltage equation that describes this waveform.
5) At what frequency does a 10 μF capacitor have a reactance of 100 Ω?
A) 159 Hz
B) 15.9 kHz
C) 1.59 kHz
6) Which one of the following polar values is equivalent to 30 + j40?
A) 50 ∠53.1°
B) 70 ∠36.9°
C) 50 ∠36.9°
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D) 1.59 MHz
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D) 70 ∠53.1°
7) Reduce the expression 5 ∠60° + 3 ∠-20°, leaving your answer in rectangular form.
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8) What is the total impedance ZT of a series network consisting of a 5 Ω resistor, an inductor having
10 Ω reactance, and a capacitor with 15 Ω reactance?
A) 5 Ω - j25 Ω
B) 5 Ω - j5 Ω
C) 5 Ω + j5 Ω
D) 5 Ω + j25 Ω
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8)
Figure 15.2
9) In a series ciruit, R = 50 Ω and XL = 20 Ω. Find ZT and θT.
A) 53.85 Ω ∠-68.2°
B) 53.85 Ω ∠+68.2°
C) 53.85 Ω ∠+21.8°
D) 53.85 Ω ∠-21.8°
9)
Figure 15.3
10) See Figure 15.3. What is ZT in polar form?
A) 5 Ω ∠10°
B) 11.2 Ω ∠63.43°
10)
C) 10 Ω ∠5°
11) What is the susceptance of a 100 μF capacitor at 1000 Hz?
A) 0.63 S
B) 10-4 S
C) 104 S
D) 11.2 Ω ∠26.6°
11)
D) 1.59 S
Figure 15.4
12) See Figure 15.4. Determine ZT, expressed in rectangular form.
A) 64.3 Ω + j76.6 Ω
B) 100 Ω + j50 Ω
C) 100 Ω + j30 Ω
D) 86.6 Ω + j50 Ω
13) What is the capacitive reactance of a 0.47 microfarads capacitor at 4300 Hz?
2
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14) What is the total impedance of a 250 mH coil in series with a 4.7 microfarad capacitor at a signal
frequency of 1000 Hz?
A) 1.54∠90 ohms
B) 1.57k∠15 ohms
C) 1.8k∠135 ohms
D) 35∠0 ohms
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Answer Key
Testname: MODULE1_SG
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D
A
v leads i by 40°
20 sin(785.4t + 45°)
A
A
5.32 + j3.3
B
C
D
A
D
79 ohms
A
4