Q. In a BJT, what is the role of the base terminal?
A.
To collect charge carriers
B.
To control the current flow
C.
To provide power
D.
To dissipate heat
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Solution
The base terminal of a BJT controls the current flow between the collector and emitter by allowing a small input current to control a larger output current.
Correct Answer:
B
— To control the current flow
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Q. What is the depletion region in a semiconductor diode?
A.
Region of high conductivity
B.
Region of low conductivity
C.
Region of high temperature
D.
Region of high voltage
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Solution
The depletion region in a semiconductor diode is a region of low conductivity where no free charge carriers are present due to recombination.
Correct Answer:
B
— Region of low conductivity
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Q. What is the effect of increasing the frequency of an AC signal on a capacitor in a circuit?
A.
It blocks the signal
B.
It allows more current to pass
C.
It has no effect
D.
It increases the impedance
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Solution
As the frequency of an AC signal increases, a capacitor allows more current to pass due to its decreasing reactance.
Correct Answer:
B
— It allows more current to pass
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Q. What is the effect of increasing the frequency of an AC signal on a diode?
A.
Increases forward voltage drop
B.
Decreases reverse recovery time
C.
Increases reverse breakdown voltage
D.
Decreases forward current
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Solution
Increasing the frequency of an AC signal decreases the reverse recovery time of a diode, allowing it to switch faster.
Correct Answer:
B
— Decreases reverse recovery time
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Q. What is the function of a rectifier in an AC circuit?
A.
To increase voltage
B.
To convert AC to DC
C.
To decrease voltage
D.
To filter signals
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Solution
Rectifiers convert alternating current (AC) into direct current (DC) by allowing current to flow in one direction.
Correct Answer:
B
— To convert AC to DC
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Q. What is the main characteristic of a FET?
A.
Current-controlled device
B.
Voltage-controlled device
C.
Power-controlled device
D.
Temperature-controlled device
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Solution
FETs (Field Effect Transistors) are voltage-controlled devices, where the output current is controlled by the voltage applied to the gate terminal.
Correct Answer:
B
— Voltage-controlled device
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Q. What is the main purpose of an operational amplifier (op-amp) in AC circuits?
A.
To convert AC to DC
B.
To amplify AC signals
C.
To rectify AC signals
D.
To filter AC signals
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Solution
Operational amplifiers are used to amplify AC signals, making them suitable for various applications in analog electronics.
Correct Answer:
B
— To amplify AC signals
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Q. What is the output of a full-wave rectifier when given an AC input?
A.
A pure AC signal
B.
A pulsating DC signal
C.
A constant DC voltage
D.
An amplified AC signal
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Solution
A full-wave rectifier converts an AC input into a pulsating DC signal by rectifying both halves of the AC waveform.
Correct Answer:
B
— A pulsating DC signal
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Q. What is the output of a half-wave rectifier when the input is a sine wave?
A.
A sine wave
B.
A square wave
C.
A pulsating DC signal
D.
A constant DC signal
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Solution
The output of a half-wave rectifier when the input is a sine wave is a pulsating DC signal, as it only allows one half of the AC waveform to pass through.
Correct Answer:
C
— A pulsating DC signal
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Q. What is the primary function of a diode in an AC circuit?
A.
To amplify the signal
B.
To rectify the current
C.
To filter noise
D.
To provide feedback
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Solution
Diodes are used to rectify alternating current (AC) into direct current (DC) by allowing current to flow in one direction only.
Correct Answer:
B
— To rectify the current
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Q. What is the primary role of a rectifier in an AC circuit?
A.
To amplify the AC signal
B.
To convert AC to DC
C.
To filter the AC signal
D.
To generate AC from DC
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Solution
The primary role of a rectifier is to convert alternating current (AC) to direct current (DC).
Correct Answer:
B
— To convert AC to DC
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Q. What is the primary use of a Zener diode in AC circuits?
A.
Rectification
B.
Voltage regulation
C.
Signal amplification
D.
Current limiting
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Solution
Zener diodes are primarily used for voltage regulation in AC circuits, maintaining a constant output voltage despite variations in input voltage.
Correct Answer:
B
— Voltage regulation
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Q. What is the purpose of an operational amplifier (op-amp) in AC applications?
A.
To convert AC to DC
B.
To amplify AC signals
C.
To rectify AC signals
D.
To filter AC signals
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Solution
Operational amplifiers are used to amplify AC signals, providing high gain and the ability to process analog signals.
Correct Answer:
B
— To amplify AC signals
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Q. What is the purpose of an operational amplifier (op-amp) in AC circuits?
A.
To convert AC to DC
B.
To amplify AC signals
C.
To filter out noise
D.
To rectify AC signals
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Solution
Op-amps are commonly used to amplify AC signals in various applications.
Correct Answer:
B
— To amplify AC signals
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Q. What type of FET is commonly used for switching applications?
A.
JFET
B.
MOSFET
C.
BJT
D.
IGBT
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Solution
MOSFETs are widely used in switching applications due to their high efficiency and fast switching speeds.
Correct Answer:
B
— MOSFET
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