Electronic Devices and Circuits Questions and Answers – Biasing in BJT Amplifier Circuits

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This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Biasing in BJT Amplifier Circuits”.

1. For Vcc = 15V, R1 = 100 kΩ, R(E) = 3.9 kΩ, R(C) = 6.8 kΩ and ß = 100, determine the dc collector current for each transistor in the figure shown below.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) 0.29 mA
b) 0.48 mA
c) 0.96 mA
d) 1.92 mA
View Answer

Answer: c
Explanation:
The dc collector current for each transistor is 0.96 mA for Vcc = 15V & R1 = 100 kΩ

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2. For Vcc = 15V, R1 = 100 kΩ, R(E) = 3.9 kΩ, R(C) = 6.8 kΩ and ß = 100, determine the dc collector voltage for each transistor in the figure shown below.
The dc collector current for each transistor is 0.96 mA for Vcc = 15V & R1 = 100 kΩ
a) 4.25 V
b) 8.5 V
c) 12.75 V
d) 17 V
View Answer

Answer: b
Explanation:
The dc collector current for each transistor is 0.96 mA for Vcc = 15V & R1 = 100 kΩ

3. Find R (in 1) for R (sig) = 5 kΩ in the figure shown below.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) 2.4 kΩ
b) 4.8 kΩ
c) 17.3 kΩ
d) 34.6 kΩ
View Answer

Answer: a
Explanation: It is the parallel combination of the 32 kΩ resistor and 2.6 kΩ resistor respectively.
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4. Find Vb1/Vsig for R(sig) = 5 kΩ from the following figure.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) 0.08 V/V
b) 0.16 V/V
c) 0.24 V/V
d) 0.32 V/V
View Answer

Answer: d
Explanation:
Find Vb1/Vsig for R(sig) = 5 kΩ from the following figure

5. Find R (in 2) from the following figure.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) 2.4 kΩ
b) 4.8 kΩ
c) 17.3 kΩ
d) 34.6 kΩ
View Answer

Answer: a
Explanation: It is the parallel combination of the 32 kΩ resistor and 2.6 kΩ resistor respectively.
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6. Find Vb2/Vb1 from the following figure.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) -34 V/V
b) -51 V/V
c) – 68.1 V/V
d) -100 V/V
View Answer

Answer: c
Explanation:
Find Vb2/Vb1 from the following figure

7. For Rl = 2 kΩ find Vo/Vb2 from the following figure.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) -59.3 V/V
b) -29.7 V/V
c) -89.1 V/V
d) None of the mentioned
View Answer

Answer: a
Explanation:
Vo/Vb2 is -59.3 V/V for Rl = 2 kΩ from the following figure
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8. Find the overall voltage gain figure.
Find dc collector current for transistor for Vcc = 15V, R1 = 100 kΩ & R(E) = 3.9 kΩ
a) 323 V/V
b) 646 V/V
c) 969 V/V
d) 1292 V/V
View Answer

Answer: d
Explanation:
Find the overall voltage gain figure

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

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

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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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