This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Frequency Response – 1”.

(Q.1-Q.3) A parallel resonant circuit has a resistance of 2k ohm and half power frequencies of 86 kHz and 90 kHz.

1. The value of capacitor is

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. The value of inductor is

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. The quality factor is

a) 22

b) 100

c) 48

d) 200

View Answer

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

(Q.4-Q.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.

4. The value of R (in ohm) is

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. The value of C is

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 = 10^{3} 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.**

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