Semiconductor Diodes Quiz

The atomic number of Silicon is

• 8

• 2

• 4

• 14

Recombination is when

• an electron falls into a hole

• a positive and negative ion bond together

• a valence electron becomes a conduction electron

• a crystal is formed

Each atom in a silicon crystal has

• four valence electrons

• four conduction electrons

• eight valence electrons, four of its own and four are shared

• no valence electrons because all shared with other atoms

The process of adding an impurity to an intrinsic semiconductor is called

• doping

• recombination

• atomic modification

• ionization

A trivalent impurity is added to silicon to create

• germanium

• an n-type semiconductor

• a p-type semiconductor

• a depletion region

The purpose of a pentavalent impurity is to

• reduce the conductivity of the silicon

• increase the number of holes

• increase the number of free electrons

• create minority carriers

The term bias means

• the ratio of majority carriers to minority carriers

• the amount of current across a diode

• a dc voltage applied to control the operation of the device

• unfair

When a diode is forward biased

• the only current is hole current

• the only current is electron current

• the only current is produced by majority carriers

• the current is produced by both holes and electrons

Although current is blocked in reverse bias

• there is some current due to majority carriers

• there is very small current due to minority carriers

• there is avalanche CURRENT

• there is lots of current due to majority of carriers

A neutral dielectric has added to it 12.5 x 1018 electrons, what is its charge in coulombs?

• -2

• 2

• -3

• 3