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Previous Year Problems on FET Video Lecture | Crash Course for IIT JAM Physics
FAQs on Previous Year Problems on FET Video Lecture - Crash Course for IIT JAM Physics
| 1. What are FETs and why are they important in electronic devices? |  |
Ans. Field Effect Transistors (FETs) are electronic devices that control the flow of current based on an electric field applied to the device. They are important in electronic devices because they can amplify or switch electronic signals with high efficiency and speed. FETs are widely used in various applications such as amplifiers, voltage regulators, and digital logic circuits.
| 2. How do FETs differ from Bipolar Junction Transistors (BJTs)? | |
Ans. FETs differ from BJTs in several ways. Firstly, FETs are voltage-controlled devices, whereas BJTs are current-controlled devices. Secondly, FETs have a high input impedance and low output impedance, while BJTs have a medium input and output impedance. Finally, FETs consume less power compared to BJTs and are more suitable for high-frequency applications.
| 3. What are the different types of FETs and their applications? | |
Ans. There are mainly two types of FETs: Junction Field Effect Transistors (JFETs) and Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs). JFETs are used in applications that require high input impedance and low noise, such as audio amplifiers. MOSFETs, on the other hand, are widely used in digital circuits, power amplifiers, and switching applications due to their high input impedance, low power consumption, and fast switching speed.
| 4. How does a FET work and what is its basic structure? | |
Ans. A FET consists of three main components: a source, a gate, and a drain. The gate is separated from the other two components by an insulating layer called the gate oxide. When a voltage is applied to the gate, an electric field is created in the underlying semiconductor material, which controls the flow of current between the source and the drain. This control is achieved by varying the width of the conductive channel in the semiconductor, which is formed when the FET is biased.
| 5. What are the advantages of using FETs in electronic circuits? | |
Ans. FETs offer several advantages in electronic circuits. They have a high input impedance, which minimizes the loading effect on preceding stages and improves the overall performance of the circuit. FETs also have a low noise figure, making them suitable for amplification of weak signals. Additionally, FETs require less power to operate, making them energy-efficient. Their high switching speed and compatibility with integrated circuit technology make them ideal for digital applications as well.
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Dec 27, 2024 Last updated |
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