This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Frequency Response – 1”.
1. A parallel resonant circuit has a resistance of 2k ohm and half power frequencies of 86 kHz and 90 kHz. What is the value of capacitor?
a) 6 µF
b) 20 nF
c) 2 nF
d) 60 µF
View Answer
Explanation: BW = 2p(90-86)k = 1/RC or C = 19.89 nF.
2. A parallel resonant circuit has a resistance of 2k ohm and half power frequencies of 86 kHz and 90 kHz. What is the value of the inductor?
a) 4.3 mH
b) 43 mH
c) 0.16 mH
d) 1.6 mH
View Answer
Explanation: w = (86 + 90)k/2 = 88 = (1/LC)(0.5) or L = 0.16 mH.
3. A parallel resonant circuit has a resistance of 2k ohm and half power frequencies of 86 kHz and 90 kHz. What is the quality factor?
a) 22
b) 100
c) 48
d) 200
View Answer
Explanation: Q = w/BW = 176pK/8pk = 22.
4. A parallel resonant circuit has a midband admittance of 25 X 10(-3) S, quality factor of 80 and a resonant frequency of 200 krad s. What is the value of R (in ohm)?
a) 40
b) 56.57
c) 80
d) 28.28
View Answer
Explanation: At mid-band frequency Y = 1/R or R = 1000/25 or 40 ohm.
5. A parallel resonant circuit has a midband admittance of 25 X 10(-3) S, quality factor of 80 and a resonant frequency of 200 krad s. What is the value of C?
a) 2 µF
b) 28.1 µF
c) 10 µF
d) 14.14 µF
View Answer
Explanation: Q = wRC or C = 80/(200 x 1000 x 40) or 10 µF.
6. A parallel RLC circuit has R 1 k and C 1 F. The quality factor at resonance is 200. The value of inductor is
a) 35.4 H
b) 25 H
c) 17.7 H
d) 50 H
View Answer
Explanation: Use Q = R (L/C)0.5.
7. A parallel circuit has R = 1k ohm , C = 50 µF and L = 10mH. The quality factor at resonance is
a) 100
b) 90.86
c) 70.7
d) None of the above
View Answer
Explanation: Use Q = R (L/C)0.5.
8. A series resonant circuit has L = 1 mH and C = 10 F. The required R (in ohm) for the BW = 15 9 . Hz is
a) 0.1
b) 0.2
c) 0.0159
d) 500
View Answer
Explanation: Use BW = R/L.
9. For the RLC parallel resonant circuit when R = 8k, L = 40 mH and C = 0.25 F, the quality factor
Q is
a) 40
b) 20
c) 30
d) 10
View Answer
Explanation: use Q = R (C/L)0.5.
10. A series resonant circuit has an inductor L = 10 mH. The resonant frequency w = 10^6 rad/s and bandwidth is BW = 103 rad/s. The value of R and C will be
a) 100 F, 10 ohm
b) 100 pF, 10 ohm
c) 100 pF, 10 Mega-ohm
d) 100 µF, 10 Meg-ohm
View Answer
Explanation: Use wxw = 1/LC and BW = R/L.
Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.
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