Q. In a BJT, which terminal is the control terminal?
-
A.
Emitter
-
B.
Collector
-
C.
Base
-
D.
Gate
Solution
The base terminal is the control terminal in a BJT, as it controls the current flow between the collector and emitter.
Correct Answer:
C
— Base
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Q. What are the two types of BJTs?
-
A.
NPN and PNP
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B.
N-channel and P-channel
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C.
N-type and P-type
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D.
Common-emitter and Common-collector
Solution
The two types of BJTs are NPN and PNP, which refer to the arrangement of the semiconductor materials.
Correct Answer:
A
— NPN and PNP
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Q. What happens when a BJT is in saturation?
-
A.
It acts as an open switch
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B.
It acts as a closed switch
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C.
It is in the active region
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D.
It is in cutoff
Solution
When a BJT is in saturation, it acts as a closed switch, allowing maximum current to flow from collector to emitter.
Correct Answer:
B
— It acts as a closed switch
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Q. What is the function of the emitter in a BJT?
-
A.
To inject charge carriers
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B.
To collect charge carriers
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C.
To control the base current
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D.
To provide biasing
Solution
The emitter in a BJT is responsible for injecting charge carriers into the base region.
Correct Answer:
A
— To inject charge carriers
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Q. What is the primary function of a Bipolar Junction Transistor (BJT)?
-
A.
Voltage regulation
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B.
Current amplification
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C.
Signal modulation
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D.
Power conversion
Solution
A BJT is primarily used for current amplification in electronic circuits.
Correct Answer:
B
— Current amplification
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Q. What is the primary use of BJTs in analog circuits?
-
A.
Switching
-
B.
Signal amplification
-
C.
Voltage regulation
-
D.
Oscillation
Solution
BJTs are primarily used for signal amplification in analog circuits.
Correct Answer:
B
— Signal amplification
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Q. What is the role of the base-emitter junction in a BJT?
-
A.
To provide thermal stability
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B.
To allow current flow when forward-biased
-
C.
To block current flow when reverse-biased
-
D.
To amplify the output signal
Solution
The base-emitter junction allows current flow when forward-biased, enabling the transistor to operate.
Correct Answer:
B
— To allow current flow when forward-biased
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Q. What is the role of the collector in a BJT?
-
A.
To provide biasing
-
B.
To inject charge carriers
-
C.
To collect charge carriers
-
D.
To control the base current
Solution
The collector in a BJT is responsible for collecting charge carriers from the base region.
Correct Answer:
C
— To collect charge carriers
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Q. What is the typical current gain (beta) range for BJTs?
-
A.
1 to 10
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B.
10 to 100
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C.
100 to 1000
-
D.
1000 to 10000
Solution
The typical current gain (beta) for BJTs ranges from 10 to 100.
Correct Answer:
B
— 10 to 100
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Q. What is the typical input impedance of a BJT in common-emitter configuration?
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A.
Low
-
B.
Medium
-
C.
High
-
D.
Very high
Solution
The typical input impedance of a BJT in common-emitter configuration is medium, allowing for reasonable signal coupling.
Correct Answer:
B
— Medium
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Q. What is the typical input impedance of a BJT in the common-emitter configuration?
-
A.
Low
-
B.
Medium
-
C.
High
-
D.
Very high
Solution
The typical input impedance of a BJT in the common-emitter configuration is medium.
Correct Answer:
B
— Medium
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Q. Which of the following is a characteristic of a BJT?
-
A.
Voltage-controlled device
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B.
Current-controlled device
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C.
Power-controlled device
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D.
Frequency-controlled device
Solution
A BJT is a current-controlled device, where the output current is controlled by the input current at the base.
Correct Answer:
B
— Current-controlled device
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Q. Which of the following is a small-signal model for a BJT?
-
A.
Hybrid-pi model
-
B.
T-model
-
C.
Both Hybrid-pi and T-model
-
D.
None of the above
Solution
Both the Hybrid-pi model and T-model are used as small-signal models for BJTs.
Correct Answer:
C
— Both Hybrid-pi and T-model
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Q. Which region of a BJT is reverse-biased in the active mode?
-
A.
Emitter-Base
-
B.
Collector-Base
-
C.
Emitter-Collector
-
D.
Base-Collector
Solution
In the active mode, the collector-base junction is reverse-biased.
Correct Answer:
B
— Collector-Base
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