Trivia Questions With Answers!

Diode Trivia Questions with Answers

Quiz questions with answers about diodes.


Electronic Diode Questions with Answers

In electronics, what is a diode?
A: A diode is a two-terminal electronic component that allows current to flow in only one direction.

A diode has low (ideally zero) resistance to current in one direction, and what in the other?
A: High (ideally infinite) resistance.

Today, what is the most common type of diode?
A: A semiconductor diode.

A semiconductor diode, is a crystalline piece of semiconductor material with what type of junction, connected to two electrical terminals?
A: A p–n junction.

What are the main components of a vacuum tube diode?
A: Two electrodes, a plate (anode) and a heated cathode.

Diodes were the first what?
A: Semiconductor electronic devices.

The discovery of crystals' rectifying abilities was made by whom?
A: German physicist Ferdinand Braun in 1874.


What were the first semiconductor diodes called?
A: Cat's whisker diodes.

What material were they made of?
A: Mineral crystals such as galena.

Today, most diodes are made of what?
A: Silicon.

Sometimes other semiconductors materials are used, such as selenium or what?
A: Germanium.

What is the most common function of a diode?
A: To allow an electric current to pass in one direction while blocking current in the opposite.

A  diode can therefore be thought about as an electronic version of a what?
A: Check valve.

This unidirectional behavior is called what?
A: Rectification.


What is it used for?
A: To convert alternating current to direct current.

This also includes extraction of modulation from what?
A: Radio signals in radio receivers.

Diodes have more complicated behavior than this simple on–off action, due to their what?
A: Nonlinear current-voltage characteristics.

Semiconductor diodes begin conducting electricity only if what?
A: A certain threshold voltage is present in the diode's forward direction.

When a diode is in a state where that threshold voltage requirement is met, it is said to be what?
A: Forward-biased.

The voltage drop across a forward-biased diode varies only a little with the what?
A: Current, and is a function of temperature.

This means a diode in effect can be used as a what?
A: Temperature sensor or voltage reference.


How can a semiconductor diodes' current–voltage characteristic be tailored?
A: By varying the semiconductor materials and doping (introducing impurities into the materials).

These techniques are used to create many types of what?
A: Special-purpose diodes that perform a variety of functions.

Zener diodes are used to do what?
A: Regulate voltage.

What function do avalanche diodes perform?
A: Protect circuits from high voltage surges.

What are varactor diodes used for?
A: To electronically tune radio and TV receivers.

Tunnel diodes are used to generate what?
A: Radio-frequency oscillations.

Diodes that produce light are called what?
A: Light-emitting diodes (LEDs).


Tunnel, Gunn and IMPATT diodes exhibit what electrical characteristic?
A: Negative resistance, which is useful in microwave and switching circuits.

When were vacuum tube diodes and semiconductor diodes developed separately?
A: At approximately the same time, in the early 1900s.

In 1873, Frederick Guthrie discovered the basic principle of operation of what?
A: Thermionic diodes.

He discovered that a positively charged electroscope could be discharged by doing what?
A: Bringing a grounded piece of white-hot metal close to it (but not actually touching it).

The same did not apply to a "what", indicating that the current flow was only possible in one direction?
A: Negatively charged electroscope.

Thomas Edison independently rediscovered the principle on what date?
A: February 13, 1880.

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