Q. In small-signal models, what does the term 'r_pi' represent in a BJT?
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A.
The input resistance
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B.
The output resistance
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C.
The transconductance
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D.
The base-emitter voltage
Solution
In small-signal models, 'r_pi' represents the input resistance looking into the base of a BJT.
Correct Answer:
A
— The input resistance
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Q. In small-signal models, what does the term 'r_pi' represent?
-
A.
The input resistance of a BJT
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B.
The output resistance of a BJT
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C.
The transconductance of a BJT
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D.
The thermal voltage
Solution
In small-signal models, 'r_pi' represents the input resistance of a BJT, which is crucial for analyzing amplifier circuits.
Correct Answer:
A
— The input resistance of a BJT
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Q. What does the term 'threshold voltage' refer to in MOSFETs?
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A.
The maximum voltage rating
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B.
The minimum gate voltage required to create a conducting channel
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C.
The voltage drop across the drain-source
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D.
The voltage at which breakdown occurs
Solution
The threshold voltage is the minimum gate voltage required to induce a conducting channel between the source and drain in a MOSFET.
Correct Answer:
B
— The minimum gate voltage required to create a conducting channel
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Q. What is the depletion region in a semiconductor?
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A.
A region with excess charge carriers
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B.
A region with no charge carriers
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C.
A region where electrons are free to move
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D.
A region that conducts electricity
Solution
The depletion region is an area in a semiconductor where charge carriers are absent, creating an electric field.
Correct Answer:
B
— A region with no charge carriers
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Q. What is the main advantage of using a MOSFET over a BJT?
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A.
Higher current handling
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B.
Lower power consumption
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C.
Better linearity
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D.
Higher voltage ratings
Solution
MOSFETs typically have lower power consumption due to their voltage-driven operation compared to current-driven BJTs.
Correct Answer:
B
— Lower power consumption
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Q. What is the primary characteristic of a Zener diode?
-
A.
It allows current to flow in one direction only
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B.
It can operate in reverse breakdown region
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C.
It has a high forward voltage drop
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D.
It is used for high-frequency applications
Solution
A Zener diode is designed to operate in the reverse breakdown region, providing voltage regulation.
Correct Answer:
B
— It can operate in reverse breakdown region
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Q. What is the primary difference between N-channel and P-channel MOSFETs?
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A.
The type of charge carriers
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B.
The gate voltage requirements
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C.
The physical size
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D.
The switching speed
Solution
The primary difference is that N-channel MOSFETs use electrons as charge carriers, while P-channel MOSFETs use holes.
Correct Answer:
A
— The type of charge carriers
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Q. What is the primary role of a gate in a MOSFET?
-
A.
To control the current flow
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B.
To amplify the signal
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C.
To provide thermal stability
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D.
To rectify the voltage
Solution
The gate in a MOSFET controls the current flow between the drain and source by applying a voltage.
Correct Answer:
A
— To control the current flow
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Q. What is the typical configuration for a common-emitter BJT amplifier?
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A.
Input at collector, output at emitter
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B.
Input at base, output at collector
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C.
Input at emitter, output at base
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D.
Input at collector, output at base
Solution
In a common-emitter configuration, the input is applied at the base and the output is taken from the collector.
Correct Answer:
B
— Input at base, output at collector
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Q. What is the typical configuration used for a common-emitter BJT amplifier?
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A.
Input at the emitter, output at the collector
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B.
Input at the base, output at the collector
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C.
Input at the collector, output at the emitter
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D.
Input at the base, output at the emitter
Solution
In a common-emitter BJT amplifier, the input is applied at the base and the output is taken from the collector.
Correct Answer:
B
— Input at the base, output at the collector
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Q. What type of rectifier allows current to flow during both halves of the AC cycle?
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A.
Half-wave rectifier
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B.
Full-wave rectifier
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C.
Bridge rectifier
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D.
Zener rectifier
Solution
A full-wave rectifier allows current to flow during both halves of the AC cycle, providing a smoother output.
Correct Answer:
B
— Full-wave rectifier
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Showing 1 to 11 of 11 (1 Pages)
