Statistics for Transistors and Semiconductors

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General Stats

This quiz has been taken 27 times
The average score is 18 of 49

Answer Stats

Question	Answer	% Correct
What do n-type semiconductors have more of?	Negative charge carriers	84%
When an atom does not have a complete outer shell, it can form what kind of bonds with nearby atoms?	Covalent Bonds	74%
A semiconductor's resistivity lies between that of an insulator and a conductor. As temperature rises in semiconductors, resistance _______.	Decreases	74%
	Ionic Bonds	68%
Semiconductors have almost filled valence bands. What are the two most common pure semiconductors?	Silicon	63%
Compared to the current, what direction do free electrons roughly travel in a conducting metal lattice?	The opposite direction	63%
What is the process of adding atoms with a different amount of valence electrons to a semiconductor?	Doping	58%
	Germanium	58%
What were early diodes and transistors made from?	Germanium	53%
What do p-type semiconductors have more of?	Positive charge carriers	53%
In semiconductors, what is the distance between the conduction and valence bands relative to insulators?	Small	53%
What direction, relative to the conduction band's current, does this new positive current flow?	The opposite direction	53%
What are the simplest form of a valves called? (They only have two electrodes)	Diodes	47%
Opposite of the above require the addition of dopant atoms. What are these semiconductors called?	Extrinsic semiconductors	47%
Silicon and Germanium do not need ^ to be a semiconductor. They are known as pure semiconductors. What is another name for them?	Intrinsic semiconductors	47%
In an insulator, the valence band is full of electrons. Therefore the gap between the bands are _____.	Large	47%
In a conductor, what do the conduction and valence bands do?	Overlap	47%
What are integrated circuits in computer chips made of?	Silicon	47%
What is the highest band occupied by electrons called?	The valence band	47%
Diodes can be made with semiconductors. In diodes, electrons travel away from what type of semiconductor?	N-type Semiconductors	42%
What are the two most common dopant atoms? (one each for n-type and p-type)	Phosphorus	42%
	Boron	32%
What word descibes the free movement of electrons in a metal lattice?	Delocalised	32%
What do the electrons leave behind in the valence band?	Positive hole	32%
It can also convert alternating current (AC) into direct current (DC). What is this called?	Rectification	32%
To get to the other semiconductor, which is the other type, what zone do the electrons travel across?	The depletion zone	32%
By being more reliable and allowing for miniturisation, transistors replaced which device in electronic devices?	Thermionic valves	32%
No two electrons in an atom can simultaneously occupy ___ ____ ______ _____.	The same energy state	32%
Due to its simplicity, ^'s unidirectional current means it is used for what simple function?	A switch	26%
	Can be used in smaller devices	26%
Lee de Forest added what to convert the simple valve into a current amplifier, or triode?	Another electrode	21%
As temperature increases, what does thermal energy allow electrons in the valence band to do?	Cross the gap	21%
What do thermionic devices use in glass vacuum tubes to control the flow of current.	Heated filaments	21%
What are ionically bonded molecules?	Insulators	21%
Solid state devices encompass transistors and what other device?	Integrated circuits	21%
	Npn transistors	21%
Transistors are semiconductor devices that can act as a switch or as an amplifier. What are the two main types of transistor?	Pnp transistors	21%
What did de Broglie proposed that electrons could also be considered as?	Standing waves	21%
What are the main benefits of solid state devices over thermionic devices?	They are smaller	21%
	Affected less by higher temperatures	16%
	Less fragile	16%
	Less heat produced	16%
	Longer lifetime	16%
	Lower voltage required	16%
	More reliable	16%
What shape do groups of silicon atoms form in a diamond lattice structure?	Tetrahedrons	16%
What is a transistor is a combination of?	two n-p junctions	16%
Integrated circuits are tiny electrical circuits used to perform specific electrical functions. What primarily is the issue with wiring that IC's reduce?	Variable resistance	16%
What were the main advantages of silicon solid state devices?	Very common in the Earth's crust	16%