CET Electronic Components and Devices

Question 1

What is the primary function of a resistor in a circuit?

Accepted Answer

To limit the current flow.

Answer

A resistor's primary function is to introduce opposition to the flow of electric current. This opposition, known as resistance, causes a voltage drop across the component and reduces the current flowing through that part of the circuit. This function is crucial for controlling current levels, protecting other components, and setting operating points in various electronic designs.

Question 2

What is the purpose of a diode in a circuit?

Accepted Answer

To allow current flow in one direction only.

Answer

A diode is a semiconductor device that acts as a one-way valve for electric current. It allows current to flow easily in one direction (forward bias) but offers very high resistance to current flow in the opposite direction (reverse bias). This property makes diodes essential for rectification, signal steering, and protection against reverse polarity.

Question 3

What does a capacitor do in an electronic circuit?

Accepted Answer

Stores and releases electrical energy.

Answer

A capacitor consists of two conductive plates separated by a dielectric insulator, designed to store electrical energy. It accumulates charge when a voltage is applied across it, creating an electric field. This stored energy can then be quickly released, making capacitors useful for filtering, smoothing power supplies, timing circuits, and temporary energy storage.

Question 4

What is an inductor used for in an electronic circuit?

Accepted Answer

To store energy in a magnetic field.

Answer

An inductor is typically a coil of wire that stores energy in a magnetic field when current flows through it. It opposes changes in current flow, a property known as inductance. This characteristic makes inductors useful for filtering, tuning circuits, energy storage in switching power supplies, and creating resonant circuits.

Question 5

What is the function of a transistor in a circuit?

Accepted Answer

To amplify or switch signals.

Answer

A transistor is a semiconductor device that can either amplify an electronic signal or act as a switch. By applying a small current or voltage to its control terminal, it can regulate a much larger current flowing between its other two terminals. This dual capability makes transistors fundamental building blocks for almost all modern electronic devices, from microprocessors to amplifiers.

(CET) Certified Electronics Technician Practice Test

(CET) Certified Electronics Technician Practice Test

CET Electronic Components and Devices