Q. In a BJT, what is the region called when it is biased in the active mode?
-
A.
Cut-off
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B.
Saturation
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C.
Active
-
D.
Reverse
Solution
In the active mode, a BJT operates in the active region where it can amplify signals.
Correct Answer:
C
— Active
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Q. What is the effect of increasing the gate voltage in an n-channel FET?
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A.
Decreases current
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B.
Increases current
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C.
No effect
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D.
Reverses current direction
Solution
Increasing the gate voltage in an n-channel FET enhances the channel conductivity, thus increasing the current.
Correct Answer:
B
— Increases current
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Q. What is the forward voltage drop of a typical silicon diode?
-
A.
0.2V
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B.
0.7V
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C.
1.2V
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D.
0.5V
Solution
A typical silicon diode has a forward voltage drop of approximately 0.7V when conducting.
Correct Answer:
B
— 0.7V
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Q. What is the output impedance of an ideal op-amp?
-
A.
Zero ohms
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B.
Infinite ohms
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C.
100 ohms
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D.
1k ohms
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. What is the primary function of a FET?
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A.
Current amplification
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B.
Voltage amplification
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C.
Voltage control
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D.
Power control
Solution
A FET primarily functions as a voltage-controlled device, where the output current is controlled by the input voltage.
Correct Answer:
C
— Voltage control
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Q. What is the primary role of a rectifier in a power supply?
-
A.
To increase voltage
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B.
To convert AC to DC
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C.
To filter noise
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D.
To regulate current
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 role of a resistor in a BJT circuit?
-
A.
To increase current gain
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B.
To limit base current
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C.
To provide feedback
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D.
To stabilize temperature
Solution
A resistor in a BJT circuit is primarily used to limit the base current to prevent damage to the transistor.
Correct Answer:
B
— To limit base current
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Q. What is the typical open-loop gain of an operational amplifier?
-
A.
1
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B.
10
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C.
100
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D.
100,000
Solution
The typical open-loop gain of an operational amplifier can be around 100,000 or more.
Correct Answer:
D
— 100,000
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