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Electrical Trivia Quiz Questions with Answers

Electrical trivia quiz with answers.


Electrical, electronics and electricity trivia quiz questions with answers.

Adding impurity atoms to a semi-conducting material is known as what?
A: Doping.

When a doped semiconductor contains excess holes it is called "p-type", and when it contains excess free electrons it is known as a what?
A: "n-type".

A semiconductor is a poor electrical conductor as a consequence of having exactly the correct number of electrons to completely fill its what?
A: Valence bonds.

What type of diodes are resistant to nuclear radiation?
A: Tunnel diodes.

In some semiconductors, excited electrons can emit light instead of producing what?
A: Heat.

Alexander Graham Bell in 1880 used the light-sensitive property of selenium to send sound over a what?
A: Beam of light.

What device was used to amplify electronic signals before the invention of the transistor?
A: The vacuum tube.


What is the purpose of a rectifier or diode?
A: It allows current to flow in only one direction.

The original transistors made at Bell Labs were made from what semiconductive element?
A: Germanium.

In 1954, who created the first silicon transistor.?
A: George Teal, a scientist at Texas Instruments.

Water could be broken down into hydrogen and oxygen by the current from a battery was discovered by Nicholson and Carlisle in 1800, a process that is now known as what?
A: Electrolysis.

The word electricity comes from the Greek word elektron, which means what?
A: Amber.

In 1752, Benjamin Franklin ran his famous kite experiment, proving that lightning was what?
A: Electricity.

In an electric circuit the number of electrons that are moving is called the current, and it's measured in what units?
A: Amps.


Diodes can be used to sense what physical property?
A: Temperature.

The pressure that pushes electrons along a wire is called the voltage and is measured in what type of units?
A: Volts.

An oscillator is an electronic circuit that makes a repetitive, oscillating electronic signal typically in the form of a sine wave or a what?
A: Square wave.

Tunnel diodes can be used as low-noise what?
A: Microwave amplifier.

An oscillator that produces frequencies of about 16 Hz to 20 kHz is called what type of oscillator?
A: Audio.

Zener diodes are used to regulate what?
A: Voltage.

The two main kinds of electric oscillators are the linear or harmonic oscillator, and the nonlinear or what?
A: Relaxation oscillator.


The phase shift oscillator and the Wien bridge oscillator are what types of oscillator?
A: RC or relaxation oscillator.

The Hartley, Colpitts and Clapp circuits are what type of oscillators?
A: LC oscillators.

The FET transistor is a type of transistor developed after the junction transistor. What does FET stand for?
A: Field Effect Transistor.

The FET transistor draws an extremely small amount power from the input signal, which overcomes a big disadvantage of what type of transistor?
A: The junction transistor.

Diodes are used commonly to convert alternating current into what?
A: Direct current.

In the world of transistors, what does MOSFET stand for?
A: Metal-oxide semiconductor field-effect transistor.

Transistors can be used as amplifiers, or as a type of what?
A: Switch.


The two main types of transistors are NPN and what?

Most Transistors have three leads, the base, emitter, and what?
A: Collector.

What property do tunnel diodes exhibit that makes them useful in some electronic circuits?
A: Negative resistance.

In electronics, a what is an electronic component with two terminals that has a low resistance to current in one direction, and high resistance in the other direction effectively allowing current to flow in only one direction?
A: A diode.

The most common type of diode today, is a crystalline piece of semiconductor material with what type of junction?
A: p–n.

The old vacuum tube diodes had two electrodes, a plate (anode) and a heated what?
A: Cathode.

What were the first semiconductor electronic devices?
A: Diodes.


Who discovered crystals' rectifying abilities in 1874?
A: German physicist Ferdinand Braun

The first semiconductor diodes, developed around 1906, were called what?
A: Cat's whisker diodes,

Most tunnel diodes today are made from what semiconductive material?
A: Germanium.

Diodes that are made to electronically tune radio and TV receivers are called what?
A: Varactor diodes.

In a diode, a junction is formed between the p and n regions which is called a what?
A: Depletion region.

A diode designed to detect light waves is called a what?
A: Photodiode.

Diodes designed to emit light are called what?
A: LEDs ( Light Emitting Diode).


A transformer is an device that transfers electrical energy between two or more circuits using the principle of electromagnetic what?
A: Induction.

A transformer will work with only what type of current?
A: Alternating current.

A transformer blocks what?
A: DC current.

Transformers can be used for matching what in circuits?
A: Impedance.

A typical transformer is constructed by winding two coils of wire around a what?
A: A common magnetic core such as iron or ferrite.

Energy is input to the transformer on the coil designated the primary winding, and the output of the device is from the what?
A: Secondary winding.

An electric current through a conductor produces a what magnetic field surrounding the wire?
A: Magnetic field.

A changing magnetic field around a conductor or wire creates a what in the wire?
A: Voltage.

The audio amplifier was invented in 1909 by whom when he invented the triode vacuum tube?
A: Lee De Forest.

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