AFCT Electronics: Components and Functions 2

Question 1

What is the primary function of a transistor in an electronic circuit?

Accepted Answer

To amplify or switch electronic signals

Answer

Transistors are semiconductor devices that can amplify weak signals or act as electronic switches. They are the fundamental building blocks of modern electronics, from amplifiers to digital logic gates.

Question 2

What component is used to store energy in an electric field between two conductive plates?

Accepted Answer

Capacitor

Answer

A capacitor stores energy in the electric field between two conductive plates separated by a dielectric (insulating) material. The capacitance depends on plate area, plate separation, and the dielectric constant.

Question 3

What does a diode do in a circuit?

Accepted Answer

Allows current to flow in one direction only

Answer

A diode is a semiconductor device that allows current to flow primarily in one direction (forward-biased) while blocking it in the reverse direction. It acts as an electronic one-way valve.

Question 4

What is the function of an inductor in an electronic circuit?

Accepted Answer

To store energy in a magnetic field when current flows through it

Answer

An inductor stores energy in its magnetic field when current flows through its coil of wire. It opposes changes in current, making it useful in filters, transformers, and energy storage applications.

Question 5

What type of resistor changes its resistance based on temperature?

Accepted Answer

Thermistor

Answer

A thermistor is a temperature-sensitive resistor whose resistance changes significantly with temperature. NTC thermistors decrease in resistance as temperature rises, while PTC thermistors increase in resistance.

(AFCT) Armed Forces Classification Test Practice Test

(AFCT) Armed Forces Classification Test Practice Test

AFCT Electronics: Components and Functions 2