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Analog Circuits
Bipolar Junction Transistor
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FET and MOSFET
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Oscillators
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Operational Amplifier
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555 Timer
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Frequency Response
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Diodes
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Feedback Amplifier
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Power Amplifier
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1
GATE ECE 2025
MCQ (Single Correct Answer)
+2
-0.67
In the circuit shown, the identical transistors Q1 and Q2 are biased in the active region with $\beta=120$. The Zener diode is in the breakdown region with $V_Z=5 \mathrm{~V}$ and $I_Z=25 \mathrm{~mA}$. If $I_L=12 \mathrm{~mA}$ and $V_{E B 1}=V_{E B 2}=0.7 \mathrm{~V}$, then the values of $R_1$ and $R_2$ (in $\mathrm{k} \Omega$, rounded off to one decimal place) are ___________ , respectively. GATE ECE 2025 Analog Circuits - Bipolar Junction Transistor Question 1 English
A
0.6 and 0.4
B
1.4 and 2.5
C
14.0 and 25.0
D
6.0 and 4.0
2
GATE ECE 2024
MCQ (More than One Correct Answer)
+2
-0

Which of the following statements is/are true for a BJT with respect to its DC current gain $\beta$?

A

Under high-level injection condition in forward active mode, $\beta$ will decrease with increase in the magnitude of collector current.

B

Under low-level injection condition in forward active mode, where the current at the emitter-base junction is dominated by recombination-generation process, $\beta$ will decrease with increase in the magnitude of collector current.

C

$\beta$ will be lower when the BJT is in saturation region compared to when it is in active region.

D

A higher value of $\beta$ will lead to a lower value of the collector-to-emitter breakdown voltage.

3
GATE ECE 2017 Set 1
Numerical
+2
-0
In the figure shown, the npn transistor acts as a switch. GATE ECE 2017 Set 1 Analog Circuits - Bipolar Junction Transistor Question 13 English

For the input vin(t)as shown in the figure, the transistor switches between the cut-off and saturation regions of operation, when T is large. Assume collector-to-emitter voltage saturation VCE(sat) = 0.2V and base-to-emitter voltage VBE = 0.7V. The minimum value of the common-base current gain$$\left( \alpha \right)$$ of the transistor for the switching should be _________.

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4
GATE ECE 2017 Set 1
Numerical
+2
-0
For the DC analysis of the Common-Emitter amplifier shown, neglect the base current and assume that the emitter and collector current are equal. Given that VT = 25mV, VBE = 0.7V, and the BJT output r0 is practically infinite. Under these conditions the midband voltage gain magnitude, av = $$\left| {{v_0}/{v_i}} \right|\,\,\,V/V,$$ is _____ GATE ECE 2017 Set 1 Analog Circuits - Bipolar Junction Transistor Question 14 English
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GATE ECE Subjects
Signals and Systems
Network Theory
Control Systems
Digital Circuits
General Aptitude
Electronic Devices and VLSI
Analog Circuits
Engineering Mathematics
Microprocessors
Communications
Electromagnetics