What Do You Know About MOSFET? Trivia Quiz
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Questions and Answers
- 1.
Which of the following devices revolutionized the computer industry?
- A.
JFET
- B.
D-MOSFET
- C.
E-MOSFET
- D.
Power FET
Correct Answer
C. E-MOSFETExplanation
The E-MOSFET (Enhancement Metal-Oxide-Semiconductor Field-Effect Transistor) revolutionized the computer industry. It is a type of transistor that is widely used in digital circuits and microprocessors. E-MOSFETs have high switching speeds, low power consumption, and high integration density, making them ideal for modern computer systems. They have played a crucial role in the development of smaller, faster, and more efficient computers, contributing to the advancement of technology and the computer industry as a whole.Rate this question:
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- 2.
The voltage that turns on an EMOS device is the
- A.
Gate-source cutoff voltage
- B.
Pinchoff voltage
- C.
Threshold voltage
- D.
Knee voltage
Correct Answer
C. Threshold voltageExplanation
The threshold voltage is the correct answer because it is the minimum voltage required to turn on an EMOS (Enhancement-mode Metal-Oxide-Semiconductor) device. This voltage level determines when the device starts conducting current and allows the flow of electrons between the source and drain terminals.Rate this question:
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- 3.
Which of these may appear on the data sheet of an enhancement-mode MOSFET?
- A.
VGS(th)
- B.
ID(on)
- C.
VGS(on)
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The correct answer is "All of the above." This means that all of the options listed (VGS(th), ID(on), and VGS(on)) may appear on the data sheet of an enhancement-mode MOSFET. The data sheet provides important information about the characteristics and performance of the MOSFET, including the threshold voltage (VGS(th)), the drain current when the device is fully turned on (ID(on)), and the voltage required to fully turn on the device (VGS(on)).Rate this question:
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- 4.
The VGS(on) of an n-channel E-MOSFET is
- A.
Less than the threshold voltage
- B.
Equal to the gate-source cutoff voltage
- C.
Greater than VDS(on)
- D.
Greater than VGS(th)
Correct Answer
D. Greater than VGS(th)Explanation
The VGS(on) of an n-channel E-MOSFET refers to the voltage between the gate and source terminals when the MOSFET is fully turned on. It represents the minimum voltage required to keep the MOSFET in the saturation region, allowing current to flow from the drain to the source. The threshold voltage (VGS(th)) is the minimum voltage required to create a conducting channel between the source and drain terminals. Since VGS(on) is the voltage needed to fully turn on the MOSFET, it must be greater than VGS(th), ensuring that the channel is fully formed and current can flow through the device.Rate this question:
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- 5.
An ordinary resistor is an example of
- A.
A three-terminal device
- B.
An active load
- C.
A passive load
- D.
A switching device
Correct Answer
C. A passive loadExplanation
An ordinary resistor is considered a passive load because it does not require any external power source to function. It simply resists the flow of electric current, converting electrical energy into heat. Unlike active loads, which actively control or manipulate the current, a resistor only dissipates energy without any active involvement. Therefore, the correct answer is a passive load.Rate this question:
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- 6.
An E-MOSFET with its gate connected to its drain is an example of
- A.
A three-terminal device
- B.
An active load
- C.
A passive load
- D.
A switching device
Correct Answer
B. An active loadExplanation
An E-MOSFET with its gate connected to its drain is an example of an active load. In this configuration, the E-MOSFET operates in the active region, where it acts as a voltage-controlled current source. The gate-to-drain connection allows the E-MOSFET to provide a load to the circuit while also amplifying the signal. This configuration is commonly used in amplifiers and other electronic circuits to provide gain and improve overall circuit performance.Rate this question:
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- 7.
An E-MOSFET that operates at cutoff or in the ohmic region is an example of
- A.
A current source
- B.
An active load
- C.
A passive load
- D.
A switching device
Correct Answer
D. A switching deviceExplanation
An E-MOSFET that operates at cutoff or in the ohmic region can be considered as a switching device because it can control the flow of current between the source and drain terminals. In the cutoff region, the MOSFET acts as an open switch, blocking the current flow. In the ohmic region, it acts as a closed switch, allowing current to flow freely. Therefore, it can be used to switch on or off the current flow, making it an example of a switching device.Rate this question:
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- 8.
CMOS stands for
- A.
Common MOS
- B.
Active-load switching
- C.
P-channel and n-channel devices
- D.
Complementary MOS
Correct Answer
D. Complementary MOSExplanation
CMOS stands for Complementary MOS. This term refers to a technology that combines both p-channel and n-channel MOS transistors on a single integrated circuit. The complementary nature of these transistors allows for efficient power consumption and reduced heat generation. CMOS technology is widely used in the design of digital integrated circuits, such as microprocessors and memory chips, due to its low power consumption and high noise immunity.Rate this question:
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- 9.
VGS(on) is always
- A.
Less than VGS(th)
- B.
Equal to VDS(on)
- C.
Greater than VGS(th)
- D.
Negative
Correct Answer
C. Greater than VGS(th)Explanation
The given answer states that VGS(on) is greater than VGS(th). VGS(on) refers to the gate-source voltage required to turn on a MOSFET fully, while VGS(th) represents the threshold voltage at which the MOSFET starts to conduct. Since VGS(on) is the voltage required to fully turn on the MOSFET, it must be greater than the threshold voltage (VGS(th)). Therefore, the given answer is correct.Rate this question:
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- 10.
With active-load switching, the upper E-MOSFET is a
- A.
Two-terminal device
- B.
Three-terminal device
- C.
Switch
- D.
Small resistance
Correct Answer
A. Two-terminal deviceExplanation
The upper E-MOSFET in active-load switching is referred to as a two-terminal device because it has two main terminals - the source and the drain. It does not have a separate gate terminal like a three-terminal device. In active-load switching, the E-MOSFET is used as a switch to control the flow of current between the source and the drain terminals. It does not act as a small resistance in this configuration.Rate this question:
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- 11.
CMOS devices use
- A.
Bipolar transistors
- B.
Complementary E-MOSFETs
- C.
Class A operation
- D.
DMOS devices
Correct Answer
B. Complementary E-MOSFETsExplanation
CMOS devices use Complementary E-MOSFETs. Complementary metal-oxide-semiconductor (CMOS) technology utilizes a combination of both N-channel and P-channel enhancement-mode MOSFETs (metal-oxide-semiconductor field-effect transistors). These transistors work together to create a low-power, high-performance integrated circuit. The complementary nature of the transistors allows for efficient switching and low power consumption, making CMOS devices suitable for a wide range of applications such as digital logic circuits, microprocessors, and memory chips.Rate this question:
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- 12.
The main advantage of CMOS is its
- A.
High power rating
- B.
Small-signal operation
- C.
Switching capability
- D.
Low power consumption
Correct Answer
D. Low power consumptionExplanation
The main advantage of CMOS is its low power consumption. CMOS technology is known for its ability to minimize power usage, making it highly efficient in terms of energy consumption. This is achieved by using complementary pairs of MOSFETs (metal-oxide-semiconductor field-effect transistors), which require very little power to switch between on and off states. As a result, CMOS circuits consume significantly less power compared to other technologies, making them ideal for battery-powered devices and reducing overall energy costs.Rate this question:
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- 13.
Power FETs are
- A.
Integrated circuits
- B.
Small-signal devices
- C.
Used mostly with analog signals
- D.
Used to switch large currents
Correct Answer
D. Used to switch large currentsExplanation
Power FETs are used to switch large currents because they are designed to handle high power levels. Unlike small-signal devices, power FETs have a higher current-carrying capacity and are specifically designed for applications that require the switching of large amounts of current. They are commonly used in power electronics and applications such as motor control, power supplies, and high-power amplifiers.Rate this question:
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- 14.
When the internal temperature increases in a power FET, the
- A.
Threshold voltage increases
- B.
Gate current decreases
- C.
Drain current decreases
- D.
Saturation current increases
Correct Answer
C. Drain current decreasesExplanation
When the internal temperature of a power FET increases, it causes an increase in the resistance of the channel between the drain and the source. This increased resistance restricts the flow of current from the drain to the source, resulting in a decrease in the drain current.Rate this question:
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- 15.
Most small-signal E-MOSFETs are found in
- A.
Heavy-current applications
- B.
Discrete circuits
- C.
Disk drives
- D.
Integrated circuits
Correct Answer
D. Integrated circuitsExplanation
Small-signal E-MOSFETs are commonly found in integrated circuits. Integrated circuits are compact and densely packed with electronic components, allowing for the integration of multiple functions on a single chip. Small-signal E-MOSFETs are used in these circuits to amplify and process weak electrical signals. They are ideal for applications that require low power consumption and high integration density, making them a suitable choice for integrated circuits.Rate this question:
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- 16.
Most power FETS are
- A.
Used in high-current applications
- B.
Digital computers
- C.
RF stages
- D.
Integrated circuits
Correct Answer
A. Used in high-current applicationsExplanation
Power FETs are specifically designed to handle high currents and are commonly used in applications that require high-power amplification or switching. These applications include power supplies, motor control, audio amplifiers, and various industrial applications. Power FETs have a larger size and higher current-carrying capacity compared to other types of FETs, making them suitable for high-current applications. Digital computers, RF stages, and integrated circuits typically use other types of FETs that are optimized for their specific requirements.Rate this question:
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- 17.
An n-channel E-MOSFET conducts when it has
- A.
VGS > VP
- B.
An n-type inversion layer
- C.
VDS > 0
- D.
Depletion layers
Correct Answer
B. An n-type inversion layerExplanation
When an n-channel E-MOSFET has an n-type inversion layer, it means that the gate-source voltage (VGS) is greater than the threshold voltage (VP). This allows the formation of an inversion layer in the n-type substrate, creating a conductive channel between the source and drain regions. Additionally, for the E-MOSFET to conduct, there needs to be a positive drain-source voltage (VDS) greater than zero. The presence of depletion layers is not necessary for the E-MOSFET to conduct.Rate this question:
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- 18.
With CMOS, the upper MOSFET is
- A.
A passive load
- B.
An active load
- C.
Nonconducting
- D.
Complementary
Correct Answer
D. ComplementaryExplanation
The upper MOSFET in a CMOS (Complementary Metal-Oxide-Semiconductor) configuration is complementary to the lower MOSFET. This means that when the lower MOSFET is conducting, the upper MOSFET is nonconducting, and vice versa. This complementary behavior allows for efficient switching and reduces power consumption in CMOS circuits. Therefore, the correct answer is "Complementary".Rate this question:
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- 19.
The high output of a CMOS inverter is
- A.
VDD/2
- B.
VGS
- C.
VDS
- D.
VDD
Correct Answer
D. VDDExplanation
The high output of a CMOS inverter is VDD because in a CMOS inverter, when the input voltage is low (0V), the PMOS transistor is on and the NMOS transistor is off. This allows the VDD voltage to be pulled up to the output, resulting in a high output voltage of VDD.Rate this question:
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- 20.
The RDS(on) of a power FET
- A.
Is always large
- B.
Has a negative temperature coefficient
- C.
Has a positive temperature coefficient
- D.
Is an active load
Correct Answer
C. Has a positive temperature coefficientExplanation
The RDS(on) of a power FET has a positive temperature coefficient. This means that as the temperature increases, the resistance between the drain and source of the FET also increases. This is due to the increase in carrier scattering and mobility reduction at higher temperatures. As a result, the FET becomes less efficient and may generate more heat, leading to further temperature rise. This positive temperature coefficient is an important consideration in power FET design and thermal management.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Nov 15, 2011Quiz Created by
Rockycholeric
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