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 2
Numerical
+2
-0
In the circuit shown, transistors Q1 and Q2 are biased at a collector current of 2.6 mA. Assuming that transistor current gains are sufficiently large to assume collector current equal to emitter current and thermal voltage of 26m V, the magnitude of voltage gain Vo/Vs in the mid-band frequency range is _____________ (up to second decimal place). GATE ECE 2017 Set 2 Analog Circuits - Bipolar Junction Transistor Question 12 English
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4
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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