Q. In semiconductor physics, what is a p-n junction?
A.
A type of transistor
B.
A boundary between p-type and n-type materials
C.
A method of signal modulation
D.
A type of capacitor
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Solution
A p-n junction is the interface between p-type and n-type semiconductor materials, crucial for diode operation.
Correct Answer:
B
— A boundary between p-type and n-type materials
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Q. What is the function of a rectifier in power supply circuits?
A.
To increase voltage
B.
To convert AC to DC
C.
To filter noise
D.
To amplify signals
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Solution
The primary function 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 function of a sample-and-hold circuit in an ADC?
A.
To amplify the input signal
B.
To convert the signal to digital
C.
To maintain a constant voltage level during conversion
D.
To filter out noise
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Solution
A sample-and-hold circuit captures and holds the input voltage constant during the analog-to-digital conversion process.
Correct Answer:
C
— To maintain a constant voltage level during conversion
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Q. What is the main purpose of a digital-to-analog converter (DAC)?
A.
To convert analog signals to digital
B.
To amplify analog signals
C.
To convert digital signals to analog
D.
To filter digital signals
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Solution
A digital-to-analog converter (DAC) is used to convert digital signals into analog signals.
Correct Answer:
C
— To convert digital signals to analog
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Q. What is the primary function of a diode in a rectifier circuit?
A.
To amplify the signal
B.
To allow current to flow in one direction
C.
To store electrical energy
D.
To convert AC to DC
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Solution
A diode allows current to flow in one direction, which is essential for converting alternating current (AC) to direct current (DC) in rectifier circuits.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary role of a digital-to-analog converter (DAC)?
A.
To convert analog signals to digital
B.
To amplify analog signals
C.
To convert digital signals to analog
D.
To filter digital signals
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Solution
A digital-to-analog converter (DAC) converts digital signals into corresponding analog signals for various applications.
Correct Answer:
C
— To convert digital signals to analog
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Q. What is the purpose of an operational amplifier (op-amp) in analog circuits?
A.
To convert digital signals to analog
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To store charge
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Solution
An operational amplifier is primarily used to amplify voltage signals in various analog applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the small-signal model used for in electronic circuits?
A.
To analyze large signal behavior
B.
To simplify the analysis of linear circuits
C.
To design power supplies
D.
To measure frequency response
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Solution
The small-signal model is used to simplify the analysis of linear circuits by approximating the behavior of components around a bias point.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. What is the typical output impedance of an ideal op-amp?
A.
Zero ohms
B.
Infinite ohms
C.
100 ohms
D.
1 kilo-ohm
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Solution
An ideal operational amplifier has infinite output impedance, allowing it to drive loads without affecting the output voltage.
Correct Answer:
B
— Infinite ohms
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Q. Which component is essential for the operation of a Schmitt trigger?
A.
Resistor
B.
Capacitor
C.
Diode
D.
Op-amp
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Solution
A Schmitt trigger typically uses an operational amplifier to provide hysteresis in the input-output relationship.
Correct Answer:
D
— Op-amp
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Q. Which type of diode is specifically designed for high-frequency applications?
A.
Zener diode
B.
Schottky diode
C.
Rectifier diode
D.
Light-emitting diode
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Solution
A Schottky diode is designed for high-frequency applications due to its low forward voltage drop and fast switching speed.
Correct Answer:
B
— Schottky diode
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Q. Which type of diode is specifically designed for high-speed switching applications?
A.
Zener diode
B.
Schottky diode
C.
Light-emitting diode
D.
Rectifier diode
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Solution
Schottky diodes are designed for high-speed switching applications due to their low forward voltage drop and fast recovery time.
Correct Answer:
B
— Schottky diode
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