20+ Top JFETs, MESFETs, and MODFETs with Answers
What does JFET stand for?
A) Junction Field-Effect Transistor
B) Junction-Free Electron Transistor
C) Joint FET
D) Jumper FET
Answer: A
Hint: JFET is an abbreviation for Junction Field-Effect Transistor, which describes its structure and operation.
In a JFET, the channel conductivity is controlled by:
A) Gate voltage
B) Source voltage
C) Drain voltage
D) Collector voltage
Answer: A
Hint: JFET’s channel conductivity is modulated by the gate voltage.
JFET is a type of:
A) Bipolar Junction Transistor (BJT)
B) Field-Effect Transistor (FET)
C) Metal-Oxide-Semiconductor FET (MOSFET)
D) Insulated-Gate Bipolar Transistor (IGBT)
Answer: B
Hint: JFET belongs to the category of Field-Effect Transistors.
The depletion region in a JFET lies between:
A) Gate and Source
B) Source and Drain
C) Gate and Drain
D) Collector and Emitter
Answer: A
Hint: The depletion region exists between the Gate and Source in a JFET.
In a JFET, when the gate voltage is increased (in case of an n-channel JFET), the drain current:
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero
Answer: B
Hint: In an n-channel JFET, an increase in gate voltage reduces the channel width, leading to a decrease in drain current.
What does MESFET stand for?
A) Metal-Enhanced Source FET
B) Metal-Semiconductor FET
C) Metal-Encased Silicon FET
D) Metal-Semiconductor Emitter FET
Answer: B
Hint: MESFET stands for Metal-Semiconductor FET, highlighting its structure.
The channel in a MESFET is formed between:
A) Metal and Source
B) Metal and Drain
C) Semiconductor and Source
D) Semiconductor and Drain
Answer: C
Hint: MESFET’s channel is formed between the Semiconductor and Source regions.
MESFETs are primarily used in:
A) Power applications
B) Digital circuits
C) RF and microwave applications
D) Low-frequency amplifiers
Answer: C
Hint: MESFETs find extensive usage in Radio Frequency (RF) and microwave applications.
What does MODFET stand for?
A) Metal-Oxide-Diode FET
B) Metal-Oxide-Dual FET
C) Metal-Oxide-Floating FET
D) Modulation-Doped FET
Answer: D
Hint: MODFET stands for Modulation-Doped FET, highlighting its unique doping technique.
The primary advantage of MODFET over conventional FETs is:
A) Higher breakdown voltage
B) Lower power consumption
C) Higher transconductance
D) Lower cost
Answer: C
Hint: MODFETs offer higher transconductance compared to conventional FETs.
In a MODFET, the doping concentration is highest near the:
A) Gate region
B) Drain region
C) Source region
D) Substrate region
Answer: A
Hint: The doping concentration is highest near the Gate region in a MODFET.
Which FET type exhibits the pinch-off effect?
A) JFET
B) MESFET
C) MODFET
D) Both A and B
Answer: D
Hint: Both JFET and MESFET exhibit the pinch-off effect, leading to reduced drain current.
Among JFET, MESFET, and MODFET, which one has the lowest noise figure?
A) JFET
B) MESFET
C) MODFET
D) All have the same noise figure
Answer: C
Hint: MODFET typically exhibits the lowest noise figure among these FET types.
In a JFET, the drain current is controlled by the:
A) Source voltage
B) Gate voltage
C) Drain voltage
D) Substrate voltage
Answer: B
Hint: JFET’s drain current is regulated by the gate voltage.
Which FET type is used in high-frequency and high-speed applications?
A) JFET
B) MESFET
C) MODFET
D) All of the above
Answer: B
Hint: MESFET is commonly used in high-frequency and high-speed applications due to its superior performance.
Which FET type is widely used in low-noise amplifiers and front-end receivers?
A) JFET
B) MESFET
C) MODFET
D) All of the above
Answer: A
Hint: JFET is commonly used in low-noise amplifiers and front-end receivers due to its low-noise characteristics.
The channel in a JFET is formed between:
A) N+ and P regions
B) N and P regions
C) P+ and N regions
D) N and N+ regions
Answer: B
Hint: In a JFET, the channel is formed between the N and P regions.
In a MESFET, the gate is formed by:
A) Metal contact on the P region
B) Metal contact on the N region
C) Metal contact on the substrate
D) Metal contact on the P and N regions
Answer: B
Hint: In a MESFET, the gate is formed by a metal contact on the N region.
Which FET type exhibits higher transconductance among JFET, MESFET, and MODFET?
A) JFET
B) MESFET
C) MODFET
D) All have the same transconductance
Answer: C
Hint: MODFET generally exhibits higher transconductance compared to JFET and MESFET.
Which FET type has a lower gate-to-drain capacitance (Cgd)?
A) JFET
B) MESFET
C) MODFET
D) All have the same Cgd
Answer: C
Hint: MODFET typically has a lower gate-to-drain capacitance (Cgd) compared to JFET and MESFET.
Related Posts
Analog Layout Design Interview Questions | Memory Design Interview Questions |
Physical Design Interview Questions | Verilog Interview Questions |
Digital Design Interview Questions | STA Interview Questions |