Electronic Devices and Circuits Questions and Answers – Frequency Response – 1

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

Answer: b
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

Answer: c
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

Answer: a
Explanation: Q = w/BW = 176pK/8pk = 22.
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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

Answer: a
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

Answer: c
Explanation: Q = wRC or C = 80/(200 x 1000 x 40) or 10 µF.
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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

Answer: b
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

Answer: c
Explanation: Use Q = R (L/C)0.5.
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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

Answer: a
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

Answer: b
Explanation: use Q = R (C/L)0.5.
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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

Answer: b
Explanation: Use wxw = 1/LC and BW = R/L.

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

To practice all areas of Electronic Devices and Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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