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Bipolar Junction Transistor (N-P-N And P-N-P Transistor) - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main
Quick Facts
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Junction Transistor is considered one the most difficult concept.
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26 Questions around this concept.
Solve by difficulty
A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q . By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q some resistance is seen on the multimeter. Which of the following is true for the transistor?
In the given figure, given that $\mathrm{V}_{\mathrm{BB}}$ supply can vary from 0 to 5.0 V, $V_{C C}=5 \mathrm{~V},\beta_{d c}=200,$ $ R_B=100 k \Omega, R_C=1 k \Omega$ and $V_{B E}=1.0 \mathrm{~V}$, The minimum base current and the input voltage at which the transistor will go to saturation, will be, respectively :
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be :
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In a common base amplifier, the phase difference between the input signal voltage and output voltage is :
Match the column -
For a BJT -
a) Base 1)Small in size
b) Collector 2) higher doping level
c) Emitter 3) Moderate dopping level
Concepts Covered - 1
Junction Transistor
Bipolar Junction Transistor (BJT)-
it is a three-terminal electronic device that amplifies the flow of current. It has three doped regions ( emitter, base, and collector) forming two p-n junctions between them.
Based on their construction, Bipolar junction transistors are classified into two types as
1) n-p-n transistor
2) p-n-p transistor-
All three segments (emitter, base, and collector) of a transistor have different thickness and their doping levels are also different.
The schematic symbols of both these transistors are given in the below figure.
In the schematic symbols, as shown in the above figure, the arrowhead shows the direction of conventional current in the transistor.
The three segments of a transistor-
- Emitter- This segment is on one side of the transistor. It is of moderate size and heavily doped causing it to supply a large number of carriers for the flow of current.
- Base: This is the central segment. It is very thin and lightly doped.
- Collector: This segment collects a major portion of the majority carriers supplied by the emitter. The collector side is moderately doped and larger in size as compared to the emitter.
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