Q. In a common-source FET amplifier configuration, what is the phase relationship between the input and output signals?
-
A.
In phase
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B.
Out of phase
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C.
No phase relationship
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D.
Dependent on frequency
Solution
In a common-source configuration, the output signal is inverted, meaning it is out of phase with the input signal.
Correct Answer:
B
— Out of phase
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Q. In a JFET, what is the effect of increasing the gate-source voltage (Vgs)?
-
A.
Increases the drain current
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B.
Decreases the drain current
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C.
Has no effect on the drain current
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D.
Increases the gate current
Solution
Increasing the gate-source voltage (Vgs) in a JFET decreases the drain current due to the depletion region widening.
Correct Answer:
B
— Decreases the drain current
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Q. In a MOSFET, what does the term 'threshold voltage' refer to?
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A.
The maximum voltage the device can handle
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B.
The voltage at which the device turns off
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C.
The minimum gate voltage required to create a conducting channel
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D.
The voltage drop across the drain-source terminals
Solution
The threshold voltage is the minimum gate voltage required to create a conducting channel in a MOSFET.
Correct Answer:
C
— The minimum gate voltage required to create a conducting channel
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Q. What does the term 'pinch-off' refer to in a JFET?
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A.
The maximum drain current
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B.
The minimum gate voltage
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C.
The point where the channel is fully depleted
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D.
The threshold voltage for conduction
Solution
Pinch-off occurs when the gate voltage is sufficiently negative to deplete the channel of charge carriers, limiting the drain current.
Correct Answer:
C
— The point where the channel is fully depleted
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Q. What happens to the drain current (Id) in a MOSFET when the gate voltage is increased beyond the threshold voltage?
-
A.
Id decreases
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B.
Id remains constant
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C.
Id increases
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D.
Id becomes zero
Solution
When the gate voltage exceeds the threshold voltage, the drain current (Id) increases as the channel becomes more conductive.
Correct Answer:
C
— Id increases
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Q. What is the primary function of a Field Effect Transistor (FET)?
-
A.
To amplify current
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B.
To control voltage
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C.
To switch electronic signals
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D.
To rectify AC to DC
Solution
FETs are primarily used to switch electronic signals due to their high input impedance and low power consumption.
Correct Answer:
C
— To switch electronic signals
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Q. What is the primary role of the gate terminal in a MOSFET?
-
A.
To provide power
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B.
To control the channel conductivity
-
C.
To dissipate heat
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D.
To connect to the load
Solution
The gate terminal in a MOSFET controls the channel conductivity by creating an electric field that modulates the channel.
Correct Answer:
B
— To control the channel conductivity
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Q. What is the primary use of a FET in analog circuits?
-
A.
Switching
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B.
Signal amplification
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C.
Rectification
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D.
Voltage regulation
Solution
FETs are primarily used for signal amplification in analog circuits due to their high input impedance.
Correct Answer:
B
— Signal amplification
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Q. What is the typical configuration for small-signal analysis of a FET?
-
A.
Common emitter
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B.
Common collector
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C.
Common source
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D.
Common gate
Solution
The common source configuration is commonly used for small-signal analysis of FETs due to its amplification properties.
Correct Answer:
C
— Common source
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Q. What is the typical input impedance of a FET compared to a BJT?
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A.
Higher
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B.
Lower
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C.
Equal
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D.
Variable
Solution
FETs typically have a much higher input impedance compared to BJTs, making them suitable for high-impedance applications.
Correct Answer:
A
— Higher
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Q. What is the typical output impedance of a FET in the saturation region?
-
A.
Low
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B.
High
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C.
Zero
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D.
Variable
Solution
FETs in the saturation region exhibit high output impedance, making them suitable for voltage amplification.
Correct Answer:
B
— High
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Q. Which of the following is a characteristic of depletion-mode FETs?
-
A.
They are normally off
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B.
They are normally on
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C.
They require a positive gate voltage to turn off
-
D.
They have a negative temperature coefficient
Solution
Depletion-mode FETs are normally off and require a negative gate voltage to turn on.
Correct Answer:
A
— They are normally off
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Q. Which of the following is a characteristic of enhancement-mode MOSFETs?
-
A.
Conducts with zero gate voltage
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B.
Requires a positive gate voltage to conduct
-
C.
Always conducts regardless of gate voltage
-
D.
Has a negative threshold voltage
Solution
Enhancement-mode MOSFETs require a positive gate voltage to create a conductive channel.
Correct Answer:
B
— Requires a positive gate voltage to conduct
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Q. Which type of FET is controlled by the voltage applied to the gate terminal?
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A.
Bipolar Junction Transistor (BJT)
-
B.
Junction FET (JFET)
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C.
Metal-Oxide-Semiconductor FET (MOSFET)
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D.
Insulated Gate Bipolar Transistor (IGBT)
Solution
MOSFETs are controlled by the voltage applied to the gate terminal, allowing for efficient switching.
Correct Answer:
C
— Metal-Oxide-Semiconductor FET (MOSFET)
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