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Field Effect Transistors (FET)

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Field Effect Transistors (FET) MCQ & Objective Questions

Field Effect Transistors (FET) are crucial components in electronics, and understanding them is vital for students preparing for exams. Practicing MCQs and objective questions on FET not only enhances conceptual clarity but also boosts your confidence in tackling exam questions. Engaging with practice questions helps in identifying important topics and improves your overall exam preparation.

What You Will Practise Here

  • Understanding the structure and working principle of Field Effect Transistors (FET)
  • Key differences between FET and Bipolar Junction Transistors (BJT)
  • Types of FETs: JFET, MOSFET, and their applications
  • Important formulas related to FET operation and characteristics
  • Common circuit configurations using FETs
  • Diagrams illustrating FET characteristics and output curves
  • Real-world applications of FETs in electronic devices

Exam Relevance

Field Effect Transistors (FET) are frequently featured in various examinations, including CBSE, State Boards, NEET, and JEE. Questions often focus on the operational principles, characteristics, and applications of FETs. You may encounter multiple-choice questions that require you to identify the correct type of FET for a given application or to solve numerical problems based on FET characteristics. Familiarity with these patterns will enhance your performance in exams.

Common Mistakes Students Make

  • Confusing the operation of JFETs and MOSFETs, especially in terms of gate voltage control
  • Misunderstanding the significance of the pinch-off voltage in JFETs
  • Overlooking the importance of biasing in FET circuits
  • Failing to interpret FET characteristic curves correctly

FAQs

Question: What is the main advantage of using FETs over BJTs?
Answer: FETs have high input impedance, which makes them ideal for use in high-frequency applications and reduces loading effects in circuits.

Question: How does a MOSFET differ from a JFET?
Answer: MOSFETs use an insulated gate, allowing for better control of the channel and lower power consumption compared to JFETs.

Now is the time to enhance your understanding of Field Effect Transistors (FET). Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your upcoming exams!

Q. In a common-source FET amplifier configuration, what is the phase relationship between the input and output signals?
  • A. In phase
  • B. Out of phase
  • C. No phase relationship
  • D. Dependent on frequency
Q. In a JFET, what is the effect of increasing the gate-source voltage (Vgs)?
  • A. Increases the drain current
  • B. Decreases the drain current
  • C. Has no effect on the drain current
  • D. Increases the gate current
Q. In a MOSFET, what does the term 'threshold voltage' refer to?
  • A. The maximum voltage the device can handle
  • B. The voltage at which the device turns off
  • C. The minimum gate voltage required to create a conducting channel
  • D. The voltage drop across the drain-source terminals
Q. What does the term 'pinch-off' refer to in a JFET?
  • A. The maximum drain current
  • B. The minimum gate voltage
  • C. The point where the channel is fully depleted
  • D. The threshold voltage for conduction
Q. What happens to the drain current (Id) in a MOSFET when the gate voltage is increased beyond the threshold voltage?
  • A. Id decreases
  • B. Id remains constant
  • C. Id increases
  • D. Id becomes zero
Q. What is the primary function of a Field Effect Transistor (FET)?
  • A. To amplify current
  • B. To control voltage
  • C. To switch electronic signals
  • D. To rectify AC to DC
Q. What is the primary role of the gate terminal in a MOSFET?
  • A. To provide power
  • B. To control the channel conductivity
  • C. To dissipate heat
  • D. To connect to the load
Q. What is the primary use of a FET in analog circuits?
  • A. Switching
  • B. Signal amplification
  • C. Rectification
  • D. Voltage regulation
Q. What is the typical configuration for small-signal analysis of a FET?
  • A. Common emitter
  • B. Common collector
  • C. Common source
  • D. Common gate
Q. What is the typical input impedance of a FET compared to a BJT?
  • A. Higher
  • B. Lower
  • C. Equal
  • D. Variable
Q. What is the typical output impedance of a FET in the saturation region?
  • A. Low
  • B. High
  • C. Zero
  • D. Variable
Q. Which of the following is a characteristic of depletion-mode FETs?
  • A. They are normally off
  • B. They are normally on
  • C. They require a positive gate voltage to turn off
  • D. They have a negative temperature coefficient
Q. Which of the following is a characteristic of enhancement-mode MOSFETs?
  • A. Conducts with zero gate voltage
  • B. Requires a positive gate voltage to conduct
  • C. Always conducts regardless of gate voltage
  • D. Has a negative threshold voltage
Q. Which type of FET is controlled by the voltage applied to the gate terminal?
  • A. Bipolar Junction Transistor (BJT)
  • B. Junction FET (JFET)
  • C. Metal-Oxide-Semiconductor FET (MOSFET)
  • D. Insulated Gate Bipolar Transistor (IGBT)
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