What does the abbreviation FET stand for?
The correct answer is D: Field Effect Transistor. FET stands for Field Effect Transistor, a type of transistor that controls current flow using an electric field rather than current injection (as in bipolar junction transistors). FETs include MOSFETs (Metal-Oxide-Semiconductor FETs) and JFETs (Junction FETs), and they have three terminals: gate, drain, and source. The gate terminal controls current flow between drain and source by creating an electric field that modulates the conductivity of a channel. FETs are widely used in modern electronics because they have high input impedance, low noise, and excellent high-frequency performance. For amateur radio operators, FETs are commonly found in RF amplifiers, mixers, oscillators, and switching circuits in transceivers and other equipment.
Exam Tip
FET = Field Effect Transistor. Remember the key words: 'Field Effect' - it uses an electric field to control current. The other options with 'Transmitter' are wrong because FETs are transistors, not transmitters.
Memory Aid
"FET = Field Effect Transistor. Think 'F'ield 'E'ffect 'T'ransistor. Uses electric field to control current, not current injection like BJTs."
Real-World Application
In your transceiver's RF amplifier, you might find MOSFETs (a type of FET) that amplify weak received signals. The FET's gate terminal receives the RF signal, and the electric field created by the gate voltage controls current flow from drain to source, amplifying the signal. This field-effect control provides high input impedance and low noise, making FETs ideal for sensitive receiver front-ends.
Key Concepts
Why Other Options Are Wrong
Option A (Frequency Emission Transmitter): Incorrect. This is not a standard electronics term. FET refers to a transistor type, not a transmitter.
Option B (Fast Electron Transistor): Incorrect. This is not the correct expansion of FET. The 'Field Effect' refers to how the transistor works, not electron speed.
Option C (Free Electron Transmitter): Incorrect. This is not a real term. FET is a transistor, not a transmitter, and 'Free Electron' doesn't describe how FETs function.
题目解析
The correct answer is D: Field Effect Transistor. FET stands for Field Effect Transistor, a type of transistor that controls current flow using an electric field rather than current injection (as in bipolar junction transistors). FETs include MOSFETs (Metal-Oxide-Semiconductor FETs) and JFETs (Junction FETs), and they have three terminals: gate, drain, and source. The gate terminal controls current flow between drain and source by creating an electric field that modulates the conductivity of a channel. FETs are widely used in modern electronics because they have high input impedance, low noise, and excellent high-frequency performance. For amateur radio operators, FETs are commonly found in RF amplifiers, mixers, oscillators, and switching circuits in transceivers and other equipment.
考试技巧
FET = Field Effect Transistor. Remember the key words: 'Field Effect' - it uses an electric field to control current. The other options with 'Transmitter' are wrong because FETs are transistors, not transmitters.
记忆口诀
FET = Field Effect Transistor. Think 'F'ield 'E'ffect 'T'ransistor. Uses electric field to control current, not current injection like BJTs.
实际应用示例
In your transceiver's RF amplifier, you might find MOSFETs (a type of FET) that amplify weak received signals. The FET's gate terminal receives the RF signal, and the electric field created by the gate voltage controls current flow from drain to source, amplifying the signal. This field-effect control provides high input impedance and low noise, making FETs ideal for sensitive receiver front-ends.
错误选项分析
Option A (Frequency Emission Transmitter): Incorrect. This is not a standard electronics term. FET refers to a transistor type, not a transmitter. Option B (Fast Electron Transistor): Incorrect. This is not the correct expansion of FET. The 'Field Effect' refers to how the transistor works, not electron speed. Option C (Free Electron Transmitter): Incorrect. This is not a real term. FET is a transistor, not a transmitter, and 'Free Electron' doesn't describe how FETs function.
知识点
FET, Field Effect Transistor, Transistor types, Acronyms
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.