Q. In small-signal analysis, what is the small-signal model used for?
-
A.
To analyze large signal behavior
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B.
To simplify the analysis of nonlinear devices
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C.
To predict the behavior of linear circuits under small perturbations
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D.
To measure power consumption
Solution
The small-signal model is used to predict the behavior of linear circuits when small perturbations are applied.
Correct Answer:
C
— To predict the behavior of linear circuits under small perturbations
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Q. What is the primary characteristic of a common-emitter BJT configuration?
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A.
Voltage gain greater than one
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B.
Current gain less than one
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C.
Inverted output
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D.
No phase shift
Solution
The common-emitter BJT configuration provides an inverted output signal.
Correct Answer:
C
— Inverted output
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Q. What is the primary function of a bypass capacitor in a BJT amplifier?
-
A.
To increase the input impedance
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B.
To reduce noise
-
C.
To stabilize the bias point
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D.
To improve frequency response
Solution
A bypass capacitor improves the frequency response of a BJT amplifier by allowing AC signals to bypass the emitter resistor.
Correct Answer:
D
— To improve frequency response
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Q. What is the primary role of a bypass capacitor in a BJT amplifier circuit?
-
A.
To increase gain
-
B.
To stabilize the bias point
-
C.
To filter out noise
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D.
To provide AC ground
Solution
A bypass capacitor provides an AC ground, allowing AC signals to pass while blocking DC.
Correct Answer:
D
— To provide AC ground
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Q. What is the typical voltage drop across a silicon diode when it is forward-biased?
-
A.
0.2V
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B.
0.7V
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C.
1.2V
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D.
1.5V
Solution
A silicon diode typically has a forward voltage drop of about 0.7V when conducting.
Correct Answer:
B
— 0.7V
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Q. What is the typical voltage gain of an ideal operational amplifier?
-
A.
1
-
B.
0
-
C.
Infinity
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D.
10
Solution
An ideal operational amplifier has an infinite voltage gain, meaning it can amplify a small input voltage to a much larger output voltage.
Correct Answer:
C
— Infinity
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