Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)
Asthe inductance decreases in aparallel resonant circuit, the resonant frequency
1)
A)
stays the same.
B)
is random.
C)
increases.
D)
decreases.
2)
Asthe inductance increases in aseries resonant circuit, the resonant frequency
2)
A)
decreases.
B)
increases.
C)
is random.
D)
stays the same.
3)
Asthe resistance of the inductor increases in aseries–parallel resonant circuit, the resonant
frequency
3)
A)
decreases.
B)
increases.
C)
is random.
D)
stays the same.
4)
Asthe series resistance increases in aseries resonant circuit, the resonant frequency
4)
A)
stays the same.
B)
increases.
C)
decreases.
D)
is random.
5)
Asthe parallel resistance increases in aseries–parallel resonant circuit, the resonant frequency
5)
A)
increases.
B)
decreases.
C)
stays the same.
D)
is random.
6)
The resonant frequency of aparallel resonant circuit is affected by
6)
A)
the inductance, capacitance, and parallel resistance.
B)
the capacitance and parallel resistance.
C)
the inductance and capacitance.
D)
the inductance and parallel resistance.
7)
The symbol “Q” can represent
7)
A)
reactive power.
B)
quality factor.
C)
electric charge.
D)
All of the above
D
8)
Asthe capacitance increases in aparallel resonant circuit, the resonant frequency
8)
A)
is random.
B)
increases.
C)
decreases.
D)
stays the same.
C
9)
The Qof aresonant circuit can be determined by
9)
A)
the resonant frequency.
B)
the 3dB frequencies.
C)
Both Aand B
D)
Neither Anor B
C
10)
The 3dB frequencies of aresonant circuit are considered to be equally above and below the
resonant frequency when
10)
A)
Q > 1
B)
Q > 5
C)
Q > 0.707
D)
None of the above
D
C
11)
The Qand the 3dB bandwidth of aresonant circuit are
11)
A)
the square root of one another.
B)
directly proportional.
C)
inversely proportional.
D)
None of the above
12)
At resonance, the total circuit impedance is
12)
A)
inductive.
B)
capacitive.
C)
indeterminate.
D)
real only.
13)
Asthe capacitance increases in aseries resonant circuit, the resonant frequency
13)
A)
decreases.
B)
is random.
C)
stays the same.
D)
increases.
14)
Asthe capacitance increases in aseries–parallel resonant circuit, the resonant frequency
14)
A)
stays the same.
B)
decreases.
C)
is random.
D)
increases.
15)
Resonance can occur in circuits with
15)
A)
capacitors and resistors.
B)
resistors only.
C)
inductors and capacitors.
D)
inductors and resistors.
16)
The Qof aresonant circuit can be determined by
16)
A)
measurements.
B)
theoretical equations.
C)
Both Aand B
D)
Neither Anor B
17)
One approach to predict the Qof aseries–parallel resonant circuit is to
17)
A)
perform aparallel–to–series conversion on the parallel Cand resistance of the inductor and
treat it as aseries resonant circuit.
B)
perform aseries–to–parallel conversion on the L–Rind branch and treat it as aparallel
resonant circuit.
C)
Both Aand B
D)
Neither Anor B
18)
The resonant frequency of aseries–parallel resonant circuit is affected by
18)
A)
the inductance and resistance of the inductor.
B)
the inductance and capacitance.
C)
the inductance, capacitance, and resistance of the inductor.
D)
the capacitance and resistance of the inductor.
19)
The resonant frequency of aseries resonant circuit is affected by
19)
A)
the capacitance and series resistance.
B)
the inductance and capacitance.
C)
the inductance and series resistance.
D)
None of the above
20)
Asthe parallel resistance increases in aparallel resonant circuit, the resonant frequency
20)
A)
is random.
B)
stays the same.
C)
increases.
D)
decreases.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
21)
Series–Parallel Resonant Circuit: 50 µH, Rind = 0.3 , 2 µF. Determine the resonant
frequency in kHz: ________
21)
22)
Series–Parallel Resonant Circuit: 2mH, Rind = 1.5 ,22 µF, Rpar = 4.7 k(resistance in
parallel to the resonant circuit). Determine the resonant frequency in rad/s: ________
22)
23)
Series Resonant Circuit: 20 µH, 2 µF, 0.25 .Determine the 3dB BW in Hz: ________
23)
24)
Series–Parallel Resonant Circuit: 50 µH, Rind = 0.3 , 2 µF. Determine the 3dB BW in Hz:
________
24)
25)
Series–Parallel Resonant Circuit: 2mH, Rind = 0.9 ,22 µF, Rpar = 8.7 k(resistance in
parallel to the resonant circuit). Determine the 3dB BW in Hz: ________
25)
26)
Series Resonant Circuit: 250µH, 50 µF, 0.3 .Determine the Q : ________
26)
27)
Parallel Resonant Circuit: 50 µH, 2 µF, 40 .Determine the Q : ________
27)
28)
Series–Parallel Resonant Circuit: 2mH, Rind = 1.5 ,22 µF, Rpar = 4.7 k(resistance in
parallel to the resonant circuit). Determine the 3dB BW in rad/s: ________
28)
29)
Parallel Resonant Circuit: 50 µH, 2 µF, 40 .Determine the resonant frequency in rad/s:
________
29)
30)
Series–Parallel Resonant Circuit: 50 µH, Rind = 0.3 , 2 µF. Determine the Q : ________
30)
31)
Series–Parallel Resonant Circuit: 2mH, Rind = 1.5 ,22 µF, Rpar = 4.7 k(resistance in
parallel to the resonant circuit). Determine the status of low–Qor high–Q: ________
31)
32)
Parallel Resonant Circuit: 20 µH, 2 µF, 40 .Determine the resonant frequency in Hz:
________
32)
33)
Series Resonant Circuit: 250µH, 50 µF, 0.3 .Determine the resonant frequency in rad/s:
________
33)
34)
Series–Parallel Resonant Circuit: 50 µH, Rind = 0.3 , 2 µF. Determine the upper 3dB
frequency in rad/s: ________
34)
35)
Series Resonant Circuit: 250µH, 50 µF, 0.3 .Determine the status of low–Qor high–Q:
________
35)
36)
Series–Parallel Resonant Circuit: 2mH, Rind = 0.9 ,22 µF, Rpar = 8.7 k(resistance in
parallel to the resonant circuit). Determine the lower 3dB frequency in rad/s: ________
36)
37)
Series–Parallel Resonant Circuit: 2mH, Rind = 0.9 ,22 µF, Rpar = 8.7 k(resistance in
parallel to the resonant circuit). Determine the Q : ________
37)
38)
Parallel Resonant Circuit: 20 µH, 2 µF, 40 .Determine the Q : ________
38)
39)
Series–Parallel Resonant Circuit: 2 µH, Rind = 1.5 ,20 nF. Determine the Q : ________
39)
40)
Series Resonant Circuit: 20 µH, 2 µF, 0.25 .Determine the Q : ________
40)
41)
Parallel Resonant Circuit: 20 µH, 2 µF, 40 .Determine the upper 3dB frequency in rad/s:
________
41)
42)
Parallel Resonant Circuit: 50 µH, 2 µF, 40 .Determine the status of low–Qor high–Q:
________
42)
43)
Parallel Resonant Circuit: 20 µH, 2 µF, 40 .Determine the 3dB BW in Hz: ________
43)
44)
Series Resonant Circuit: 250µH, 50 µF, 0.3 .Determine the 3dB BW in Hz: ________
44)
45)
Series Resonant Circuit: 20 µH, 2 µF, 0.25 .Determine the lower 3dB frequency in rad/s:
________
45)
46)
Series–Parallel Resonant Circuit: 2mH, Rind = 0.9 ,22 µF, Rpar = 8.7 k(resistance in
parallel to the resonant circuit). Determine the resonant frequency in Hz: ________
46)
47)
Series Resonant Circuit: 20 µH, 2 µF, 0.25 .Determine the resonant frequency in Hz:
________
47)
48)
Series–Parallel Resonant Circuit: 2mH, Rind = 1.5 ,22 µF, Rpar = 4.7 k(resistance in
parallel to the resonant circuit). Determine the Q: ________
48)
49)
Series–Parallel Resonant Circuit: 2 µH, Rind = 1.5 ,20 nF. Determine the status of low–Q
or high–Q: ________
49)
50)
Series–Parallel Resonant Circuit: 2 µH, Rind = 1.5 ,20 nF. Determine the 3dB BW in kHz:
________
50)
51)
Series–Parallel Resonant Circuit: 2 µH, Rind = 1.5 ,20 nF. Determine the resonant
frequency in rad/s: ________
51)
52)
Parallel Resonant Circuit: 50 µH, 2 µF, 40 .Determine the 3dB BW in rad/s: ________
52)
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
53)
The reactance of the inductor equals the reactance of the capacitor at the resonant frequency of a
series–parallel resonant circuit.
53)
54)
If the Qof aresonant circuit decreases, the 3dB bandwidth increases if the resonant frequency
remains the same.
54)
55)
The parallel resistance in aparallel resonant circuit does not affect the resonant frequency.
55)
56)
The impedance of the inductor equals the impedance of the capacitor at the resonant frequency of a
parallel resonant circuit.
56)
57)
The quality factor (Q) of aresonant circuit is the amount of charge stored in the capacitor.
57)
58)
The reactance of the inductor equals the reactance of the capacitor at the resonant frequency of a
parallel resonant circuit.
58)
59)
The impedance of the inductor equals the impedance of the capacitor at the resonant frequency of a
series–parallel resonant circuit.
59)
60)
The series resistance in aseries resonant circuit does not affect the resonant frequency.
60)
61)
The impedance of the inductor equals the impedance of the capacitor at the resonant frequency of a
series resonant circuit.
61)
62)
The Qof aresonant circuit depends on resistance values in the resonant circuit.
62)
63)
The slope of 40 dB/decade can exist in the magnitude Bode plot for asecond–order circuit.
63)
64)
The parallel resistance in aseries–parallel resonant circuit does not affect the resonant frequency.
64)
65)
The resistance of the inductor in aseries–parallel resonant circuit does not affect the resonant
frequency.
65)
66)
The expression for Qin terms of component values is the same for any resonant circuit.
66)
67)
The power dissipated at the 3dB frequencies in the resonant circuit is afactor of the square root of
two lower than the power dissipated at resonance.
67)
68)
The bandpass filter requires only an inductor.
68)
69)
The 3dB frequencies are symmetrical about the resonant frequency in alow–Qresonant circuit.
69)
70)
The reactance of the inductor equals the reactance of the capacitor at the resonant frequency of a
series resonant circuit.
70)
71)
The Qof aresonant circuit depends on the energy storage relative to power loss in aresonant
circuit.
71)
72)
The center frequency of the bandwidth and the resonant frequency of aresonant circuit are virtually
identical in high Qresonant circuits.
72)
Answer Key
Testname: C16
Answer Key
Testname: C16
11