ECE4A Quiz on JFET and MOSFET Concepts
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Questions and Answers

In JFET the voltage applied in the gate terminal controls the current flow while in Mosfet the voltage applied in the drain terminal ______.

  • drain to source voltage
  • controls the drain current
  • supply (correct)
  • controls the output voltage

    • In a common source JFET amplifier, what happens to the drain current (Id) when the gate-source voltage (Vgs) becomes more negative?

  • Id decreases (correct)
  • Id becomes zero
  • Id remains constant
  • Id increases

    • What is the primary application of Enhancement-Mode MOSFETs?

  • Signal switching (correct)
  • Current amplification
  • Voltage regulation
  • Voltage amplification

    • What type of device is a JFET when it is operating in the half of the Idss?

    <p>Amplifier</p> Signup and view all the answers

    What does "Idss" represent in the context of JFETs?

    <p>Saturation current</p> Signup and view all the answers

    When was the mosfet operates in enhancement mode?

    <p>When Vgs becomes positive</p> Signup and view all the answers

    Enhancement-Mode MOSFETs are normally in an "on" state without any bias voltage.

    <p>False</p> Signup and view all the answers

    What happens to the Drain current (Id) in a JFET as the Gate-to-Source voltage (Vgs) becomes more negative in the saturation region?

    <p>It decreases</p> Signup and view all the answers

    When was the formation of channel begin in P-channel E-Mosfet?

    <p>When Vgs is greater than threshold voltage</p> Signup and view all the answers

    What is the primary advantage of using Enhancement-Mode MOSFETs in digital circuits?

    <p>They have a normally &quot;on&quot; state.</p> Signup and view all the answers

    Which of the following corresponds to this symbol?

    <p>N-ch D-Mosfet</p> Signup and view all the answers

    In an N-channel JFET, what type of charge carriers are responsible for current flow between the Drain and Source?

    <p>Electrons</p> Signup and view all the answers

    Which region of operation in a JFET corresponds to maximum Drain current?

    <p>Active</p> Signup and view all the answers

    What type of voltage does the Drain terminal provide in a JFET circuit?

    <p>Output voltage</p> Signup and view all the answers

    In E-Mosfet operation, when gate to source voltage increases, what happen to transistor?

    <p>free electrons increase, drain current increases and internal resistance decreases</p> Signup and view all the answers

    Depletion-Mode MOSFETs are normally in an "on" state without any bias voltage.

    <p>True</p> Signup and view all the answers

    What does JFET stand for?

    <p>Junction Field-Effect Transistor</p> Signup and view all the answers

    Which terminal of a JFET is typically connected to the ground or reference potential in a circuit?

    <p>Source</p> Signup and view all the answers

    Which of the following biasing techniques provides good stability but may be less efficient in terms of power consumption?

    <p>Voltage divider biasing</p> Signup and view all the answers

    What is the primary advantage of the common gate JFET configuration in amplifier applications?

    <p>Low input impedance</p> Signup and view all the answers

    Which type of transistor is often used in high-power amplification applications?

    <p>MOSFET</p> Signup and view all the answers

    In which type of MOSFET is the gate-source voltage (Vgs) used to control the channel resistance and, therefore, the drain current (Id)?

    <p>Enhancement-Mode</p> Signup and view all the answers

    What happens when the gate terminal of the JFET is shorted to the ground terminal and the source voltage is less than the pinch-off voltage?

    <p>JFET operates in the ohmic region</p> Signup and view all the answers

    In self-biasing, how does an increase in the drain current (Id) affect the gate-source voltage (Vgs)?

    <p>Vgs decreases</p> Signup and view all the answers

    What is the approximate voltage range for the Gate-to-Source voltage (V_gs) in the active region of an N-channel JFET?

    <p>-Vp &lt; Vgs &lt; 0</p> Signup and view all the answers

    Which type of MOSFET is typically used in power switching applications?

    <p>Enhancement-Mode</p> Signup and view all the answers

    In a common source JFET configuration, the input is applied to which terminal?

    <p>Gate</p> Signup and view all the answers

    Which type of MOSFET is more commonly used in digital integrated circuits (ICs)?

    <p>Enhancement-Mode</p> Signup and view all the answers

    In a JFET, what happens to the Drain current (Id) when the Gate-to-Source voltage (Vgs) is zero?

    <p>It decreases</p> Signup and view all the answers

    In self biased JFET configuration, the source terminal is directly connected to ______.

    <p>ground</p> Signup and view all the answers

    The conductivity of the Mosfet is controlled by:

    <p>reverse biased at the gate terminal</p> Signup and view all the answers

    What is the primary parameter used to control the Drain current (Id) in a JFET?

    <p>Gate-Source voltage (Vgs)</p> Signup and view all the answers

    What happens to the Drain current (Id) in a JFET as the Gate-to-Source voltage (Vgs) becomes more negative in the active region?

    <p>It becomes zero</p> Signup and view all the answers

    What should be done to turned off the enhancement Mosfet?

    <p>The input voltage should be less than threshold voltage</p> Signup and view all the answers

    Which type of MOSFET requires a gate-source voltage (Vgs) greater than zero to turn on?

    <p>Enhancement-Mode</p> Signup and view all the answers

    Which JFET configuration is also known as the "emitter follower" in bipolar transistor terms?

    <p>Common drain</p> Signup and view all the answers

    In an N-channel Enhancement-Mode MOSFET, what happens to the drain current (Id) when the gate-source voltage (Vgs) becomes more positive?

    <p>Id increases</p> Signup and view all the answers

    In a JFET, what is the primary role of the Drain terminal?

    <p>To provide a path for current to exit the device</p> Signup and view all the answers

    In which type of MOSFET is the drain current (Id) typically controlled by the gate voltage over a wide range?

    <p>Enhancement-Mode</p> Signup and view all the answers

    In which region does a JFET act as a variable resistor?

    <p>Active</p> Signup and view all the answers

    Which of the following statements about Depletion-Mode MOSFETs is true?

    <p>They have a very high input impedance.</p> Signup and view all the answers

    What is the primary application of Depletion-Mode MOSFETs?

    <p>Current amplification</p> Signup and view all the answers

    Which type of MOSFET requires a gate-source voltage (Vgs) of zero to turn on?

    <p>Depletion-Mode</p> Signup and view all the answers

    In a common drain JFET configuration, the drain terminal is connected to ______.

    <p>output terminal</p> Signup and view all the answers

    What type of voltage does the Source terminal provide in a common gate JFET circuit?

    <p>Input voltage</p> Signup and view all the answers

    When was N-channel Enhancement Mosfet turned "on"?

    <p>When Vgs &gt; Vth</p> Signup and view all the answers

    Which of the following statements about P-channel Enhancement-Mode MOSFETs is true?

    <p>They require a negative Vgs to turn on.</p> Signup and view all the answers

    In a N-channel Depletion-Mode MOSFET, what happens to the drain current (Id) when the gate-source voltage (Vgs) becomes more negative?

    <p>Id decreases</p> Signup and view all the answers

    What is the primary advantage of using Depletion-Mode MOSFETs in amplification circuits?

    <p>They have a normally &quot;on&quot; state.</p> Signup and view all the answers

    What is the primary function of a JFET in the active region?

    <p>To amplify signals</p> Signup and view all the answers

    Which type of MOSFET is more susceptible to electrostatic discharge (ESD) damage?

    <p>Depletion-Mode</p> Signup and view all the answers

    Which of the following trasistors does not have continous channel?

    <p>N-channel E-Mosfet</p> Signup and view all the answers

    Which type of MOSFET is typically "off" in its natural state (without any bias voltage)?

    <p>Enhancement-Mode</p> Signup and view all the answers

    When an N-channel Depletion MOSFET is in active condition condition, what should be done to turned it off?

    <p>Apply enough negative Vgs</p> Signup and view all the answers

    In fixed biasing of a JFET, what component is typically used to set the bias voltage at the gate terminal?

    <p>A variable resistor</p> Signup and view all the answers

    Study Notes

    ECE4A_Q1A Multiple Choice

    • Question 1: In a JFET, the gate voltage controls the current; in a MOSFET, the drain voltage controls the current.

    • Question 2: In a common source JFET amplifier, as the gate-source voltage (Vgs) becomes more negative, the drain current (Id) decreases.

    • Question 3: Enhancement-mode MOSFETs are primarily used for signal switching.

    • Question 4: A JFET operating at half its Idss is a voltage-controlled resistor.

    • Question 5: Idss in a JFET represents the saturation current.

    • Question 6: A MOSFET operates in enhancement mode during channel formation or when charge carriers are added to the channel. It operates when drain current exceeds Idss and Vgs is positive.

    • Question 7: Enhancement-mode MOSFETs are typically "on" without bias voltage. This is true.

    • Question 8: In a JFET in the saturation region, as the gate-source voltage (Vgs) becomes more negative, the drain current (Id) decreases.

    • Question 9: The P-channel enhancement MOSFET channel begins to form when the gate-source voltage (Vgs) is greater than the threshold voltage and becomes positive.

    • Question 10: The primary advantage of enhancement MOSFETs in digital circuits is that they have a normally "on" state, leading to better noise performance.

    • Question 11: The symbol represents an N-channel enhancement MOSFET.

    • Question 12: In an N-channel JFET, the charge carriers responsible for current flow between drain and source are electrons.

    • Question 13: The JFET region of operation with maximum drain current is the active region.

    • Question 14: The drain terminal in a JFET provides the output voltage.

    • Question 15: In an Enhancement MOSFET, as the gate-to-source voltage (Vgs) increases, free electrons increase, drain current increases, and internal resistance decreases.

    • Question 16: Depletion-mode MOSFETs are not normally in an "on" state without bias voltage. This is false.

    • Question 17: JFET stands for Junction Field-Effect Transistor.

    • Question 18: The source terminal of a JFET is typically connected to ground.

    • Question 19: Voltage divider biasing provides good stability but may not be the most efficient in terms of power consumption.

    • Question 20: The JFET region of operation with minimal drain current is the cut-off region.

    • Question 21: The primary advantage of the common-gate JFET configuration is low noise.

    • Question 22: Bipolar junction transistors (BJTs) are often used in high-power applications.

    • Question 23: In both depletion and enhancement MOSFETs, gate-to-source voltage (Vgs) controls the channel resistance and, therefore, the drain current (Id).

    • Question 24: When the gate terminal of a JFET is shorted to the ground terminal and the source voltage is less than the pinch-off voltage, the JFET operates in the ohmic region.

    • Question 25: In self-biasing, an increase in drain current (Id) decreases the gate-source voltage (Vgs).

    • Question 26: The approximate voltage range for gate-to-source voltage (Vgs) in the active region of an N-channel JFET is not provided. (needs more context to answer).

    • Question 27: Enhancement-mode MOSFETs are typically used in power switching applications.

    • Question 28: In a common-source JFET configuration, the input is applied to the gate terminal.

    • Question 29: Enhancement-mode MOSFETs are commonly used in digital integrated circuits (ICs).

    • Question 30: The region of operation in a JFET with minimum drain current is the cut-off region.

    • Question 31: When the gate-to-source voltage in a JFET is zero, the drain current (Id) remains constant.

    • Question 32: In a self-biased JFET configuration, the source terminal is directly connected to the supply.

    • Question 33: The conductivity of the MOSFET is controlled by the reverse-biased voltage at the gate terminal and the induced charge carriers in the channel.

    • Question 34: The gate-source voltage (Vgs) controls the drain current (Id) in a JFET.

    • Question 35: In a JFET in the active region, as the gate-source voltage (Vgs) becomes more negative, the drain current (Id) decreases.

    • Question 36: Turning off an enhancement MOSFET requires setting the input voltage lower than the threshold voltage.

    • Question 37: Enhancement-mode MOSFETs require a gate-source voltage (Vgs) greater than zero to turn on.

    • Question 38: The common-drain JFET configuration is also known as the source follower.

    • Question 39: Vp in a JFET refers to the pinch-off voltage.

    • Question 40: In an N-channel enhancement MOSFET, as the gate-source voltage (Vgs) becomes more positive, the drain current (Id) increases.

    • Question 41-60: (See the answer key for answers.)

    Answer Key

    • The answer key provides the correct answers to each multiple-choice question. The answer key is located on page 8.

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    Related Documents

    ECE4A_Q1A Quiz1-AnalogIC-ECE4A_SetA PDF

    Description

    Test your understanding of JFET and MOSFET fundamentals with this multiple-choice quiz. The questions cover various principles such as how gate and drain voltages affect current, as well as the operational modes of these devices. Perfect for ECE students looking to assess their knowledge in electronics.

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